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Finding the Fourth Proportional to 520,029.10, 780,043.65 and 431,382.70

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Solution

The fourth proportional to 520,029.10, 780,043.65 and 431,382.70 is: 647,074.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,029.10 : 780,043.65 = 431,382.70 : x
  2. Step 2: Convert to fraction form
    520,029.10/780,043.65 = 431,382.70/x
  3. Step 3: Cross multiply
    520,029.10x = 780,043.65 × 431,382.70
  4. Step 4: Simplify right side
    520,029.10x = 336,497,335,854.86
  5. Step 5: Solve for x
    x = 336,497,335,854.86/520,029.10
  6. Step 6: Final answer
    x = 647,074.05

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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.