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Finding the Fourth Proportional to 621.44, 932.80 and 478.72

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Solution

The fourth proportional to 621.44, 932.80 and 478.72 is: 718.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.44 : 932.80 = 478.72 : x
  2. Step 2: Convert to fraction form
    621.44/932.80 = 478.72/x
  3. Step 3: Cross multiply
    621.44x = 932.80 × 478.72
  4. Step 4: Simplify right side
    621.44x = 446,550.02
  5. Step 5: Solve for x
    x = 446,550.02/621.44
  6. Step 6: Final answer
    x = 718.57

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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.