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Finding the Fourth Proportional to 612,714.30, 919,071.45 and 455,250.30

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Solution

The fourth proportional to 612,714.30, 919,071.45 and 455,250.30 is: 682,875.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,714.30 : 919,071.45 = 455,250.30 : x
  2. Step 2: Convert to fraction form
    612,714.30/919,071.45 = 455,250.30/x
  3. Step 3: Cross multiply
    612,714.30x = 919,071.45 × 455,250.30
  4. Step 4: Simplify right side
    612,714.30x = 418,407,553,333.94
  5. Step 5: Solve for x
    x = 418,407,553,333.94/612,714.30
  6. Step 6: Final answer
    x = 682,875.45

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.