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Finding the Fourth Proportional to 520,049.60, 780,074.40 and 431,403.20

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Solution

The fourth proportional to 520,049.60, 780,074.40 and 431,403.20 is: 647,104.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,049.60 : 780,074.40 = 431,403.20 : x
  2. Step 2: Convert to fraction form
    520,049.60/780,074.40 = 431,403.20/x
  3. Step 3: Cross multiply
    520,049.60x = 780,074.40 × 431,403.20
  4. Step 4: Simplify right side
    520,049.60x = 336,526,592,398.08
  5. Step 5: Solve for x
    x = 336,526,592,398.08/520,049.60
  6. Step 6: Final answer
    x = 647,104.80

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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.