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Finding the Fourth Proportional to 520,072.60, 780,108.90 and 431,426.20

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Solution

The fourth proportional to 520,072.60, 780,108.90 and 431,426.20 is: 647,139.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,072.60 : 780,108.90 = 431,426.20 : x
  2. Step 2: Convert to fraction form
    520,072.60/780,108.90 = 431,426.20/x
  3. Step 3: Cross multiply
    520,072.60x = 780,108.90 × 431,426.20
  4. Step 4: Simplify right side
    520,072.60x = 336,559,418,313.18
  5. Step 5: Solve for x
    x = 336,559,418,313.18/520,072.60
  6. Step 6: Final answer
    x = 647,139.30

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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.