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Finding the Fourth Proportional to 520,918.20, 781,377.30 and 442,380.60

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Solution

The fourth proportional to 520,918.20, 781,377.30 and 442,380.60 is: 663,570.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,918.20 : 781,377.30 = 442,380.60 : x
  2. Step 2: Convert to fraction form
    520,918.20/781,377.30 = 442,380.60/x
  3. Step 3: Cross multiply
    520,918.20x = 781,377.30 × 442,380.60
  4. Step 4: Simplify right side
    520,918.20x = 345,666,158,800.38
  5. Step 5: Solve for x
    x = 345,666,158,800.38/520,918.20
  6. Step 6: Final answer
    x = 663,570.90

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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.