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Finding the Fourth Proportional to 92.50, 138.77 and 90.97

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Solution

The fourth proportional to 92.50, 138.77 and 90.97 is: 136.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.50 : 138.77 = 90.97 : x
  2. Step 2: Convert to fraction form
    92.50/138.77 = 90.97/x
  3. Step 3: Cross multiply
    92.50x = 138.77 × 90.97
  4. Step 4: Simplify right side
    92.50x = 12,623.91
  5. Step 5: Solve for x
    x = 12,623.91/92.50
  6. Step 6: Final answer
    x = 136.47

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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.