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Finding the Fourth Proportional to 31.76, 47.62 and 13.70

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Solution

The fourth proportional to 31.76, 47.62 and 13.70 is: 20.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.76 : 47.62 = 13.70 : x
  2. Step 2: Convert to fraction form
    31.76/47.62 = 13.70/x
  3. Step 3: Cross multiply
    31.76x = 47.62 × 13.70
  4. Step 4: Simplify right side
    31.76x = 652.53
  5. Step 5: Solve for x
    x = 652.53/31.76
  6. Step 6: Final answer
    x = 20.55

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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.