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Finding the Fourth Proportional to 479,716, 661,392.72 and 393,356.80

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Solution

The fourth proportional to 479,716, 661,392.72 and 393,356.80 is: 542,327.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,716 : 661,392.72 = 393,356.80 : x
  2. Step 2: Convert to fraction form
    479,716/661,392.72 = 393,356.80/x
  3. Step 3: Cross multiply
    479,716x = 661,392.72 × 393,356.80
  4. Step 4: Simplify right side
    479,716x = 260,163,323,882.50
  5. Step 5: Solve for x
    x = 260,163,323,882.50/479,716
  6. Step 6: Final answer
    x = 542,327.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.