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Finding the Fourth Proportional to 92.72, 139.70 and 92.12

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Solution

The fourth proportional to 92.72, 139.70 and 92.12 is: 138.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.72 : 139.70 = 92.12 : x
  2. Step 2: Convert to fraction form
    92.72/139.70 = 92.12/x
  3. Step 3: Cross multiply
    92.72x = 139.70 × 92.12
  4. Step 4: Simplify right side
    92.72x = 12,869.16
  5. Step 5: Solve for x
    x = 12,869.16/92.72
  6. Step 6: Final answer
    x = 138.80

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.