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Finding the Fourth Proportional to 612,759.60, 919,139.40 and 545,108.40

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Solution

The fourth proportional to 612,759.60, 919,139.40 and 545,108.40 is: 817,662.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,759.60 : 919,139.40 = 545,108.40 : x
  2. Step 2: Convert to fraction form
    612,759.60/919,139.40 = 545,108.40/x
  3. Step 3: Cross multiply
    612,759.60x = 919,139.40 × 545,108.40
  4. Step 4: Simplify right side
    612,759.60x = 501,030,607,710.96
  5. Step 5: Solve for x
    x = 501,030,607,710.96/612,759.60
  6. Step 6: Final answer
    x = 817,662.60

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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.