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Finding the Fourth Proportional to 479,812.48, 715,839.20 and 431,985.76

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Solution

The fourth proportional to 479,812.48, 715,839.20 and 431,985.76 is: 644,485.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,812.48 : 715,839.20 = 431,985.76 : x
  2. Step 2: Convert to fraction form
    479,812.48/715,839.20 = 431,985.76/x
  3. Step 3: Cross multiply
    479,812.48x = 715,839.20 × 431,985.76
  4. Step 4: Simplify right side
    479,812.48x = 309,232,340,849.79
  5. Step 5: Solve for x
    x = 309,232,340,849.79/479,812.48
  6. Step 6: Final answer
    x = 644,485.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.