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Finding the Fourth Proportional to 521.71, 783.24 and 478.72

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Solution

The fourth proportional to 521.71, 783.24 and 478.72 is: 718.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.71 : 783.24 = 478.72 : x
  2. Step 2: Convert to fraction form
    521.71/783.24 = 478.72/x
  3. Step 3: Cross multiply
    521.71x = 783.24 × 478.72
  4. Step 4: Simplify right side
    521.71x = 374,951.84
  5. Step 5: Solve for x
    x = 374,951.84/521.71
  6. Step 6: Final answer
    x = 718.70

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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.