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Finding the Fourth Proportional to 521.76, 721.43 and 475.17

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Solution

The fourth proportional to 521.76, 721.43 and 475.17 is: 657.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.76 : 721.43 = 475.17 : x
  2. Step 2: Convert to fraction form
    521.76/721.43 = 475.17/x
  3. Step 3: Cross multiply
    521.76x = 721.43 × 475.17
  4. Step 4: Simplify right side
    521.76x = 342,801.89
  5. Step 5: Solve for x
    x = 342,801.89/521.76
  6. Step 6: Final answer
    x = 657.01

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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.