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Finding the Fourth Proportional to 92.57, 138.86 and 31.70

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Solution

The fourth proportional to 92.57, 138.86 and 31.70 is: 47.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.57 : 138.86 = 31.70 : x
  2. Step 2: Convert to fraction form
    92.57/138.86 = 31.70/x
  3. Step 3: Cross multiply
    92.57x = 138.86 × 31.70
  4. Step 4: Simplify right side
    92.57x = 4,402.54
  5. Step 5: Solve for x
    x = 4,402.54/92.57
  6. Step 6: Final answer
    x = 47.56

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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.