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Finding the Fourth Proportional to 520,045.10, 780,067.65 and 431,398.70

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Solution

The fourth proportional to 520,045.10, 780,067.65 and 431,398.70 is: 647,098.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,045.10 : 780,067.65 = 431,398.70 : x
  2. Step 2: Convert to fraction form
    520,045.10/780,067.65 = 431,398.70/x
  3. Step 3: Cross multiply
    520,045.10x = 780,067.65 × 431,398.70
  4. Step 4: Simplify right side
    520,045.10x = 336,520,170,122.06
  5. Step 5: Solve for x
    x = 336,520,170,122.06/520,045.10
  6. Step 6: Final answer
    x = 647,098.05

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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.