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Finding the Fourth Proportional to 520,278.80, 779,543.40 and 431,049.20

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Solution

The fourth proportional to 520,278.80, 779,543.40 and 431,049.20 is: 645,849.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,278.80 : 779,543.40 = 431,049.20 : x
  2. Step 2: Convert to fraction form
    520,278.80/779,543.40 = 431,049.20/x
  3. Step 3: Cross multiply
    520,278.80x = 779,543.40 × 431,049.20
  4. Step 4: Simplify right side
    520,278.80x = 336,021,558,935.28
  5. Step 5: Solve for x
    x = 336,021,558,935.28/520,278.80
  6. Step 6: Final answer
    x = 645,849.03

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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.