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Finding the Fourth Proportional to 63.71, 95.51 and 31.21

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Solution

The fourth proportional to 63.71, 95.51 and 31.21 is: 46.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.71 : 95.51 = 31.21 : x
  2. Step 2: Convert to fraction form
    63.71/95.51 = 31.21/x
  3. Step 3: Cross multiply
    63.71x = 95.51 × 31.21
  4. Step 4: Simplify right side
    63.71x = 2,980.71
  5. Step 5: Solve for x
    x = 2,980.71/63.71
  6. Step 6: Final answer
    x = 46.79

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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.