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Finding the Fourth Proportional to 520,024.60, 780,036.90 and 431,378.20

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Solution

The fourth proportional to 520,024.60, 780,036.90 and 431,378.20 is: 647,067.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,024.60 : 780,036.90 = 431,378.20 : x
  2. Step 2: Convert to fraction form
    520,024.60/780,036.90 = 431,378.20/x
  3. Step 3: Cross multiply
    520,024.60x = 780,036.90 × 431,378.20
  4. Step 4: Simplify right side
    520,024.60x = 336,490,913,855.58
  5. Step 5: Solve for x
    x = 336,490,913,855.58/520,024.60
  6. Step 6: Final answer
    x = 647,067.30

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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.