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Finding the Fourth Proportional to 612,811.40, 919,217.10 and 455,347.40

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Solution

The fourth proportional to 612,811.40, 919,217.10 and 455,347.40 is: 683,021.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,811.40 : 919,217.10 = 455,347.40 : x
  2. Step 2: Convert to fraction form
    612,811.40/919,217.10 = 455,347.40/x
  3. Step 3: Cross multiply
    612,811.40x = 919,217.10 × 455,347.40
  4. Step 4: Simplify right side
    612,811.40x = 418,563,116,520.54
  5. Step 5: Solve for x
    x = 418,563,116,520.54/612,811.40
  6. Step 6: Final answer
    x = 683,021.10

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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.