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Finding the Fourth Proportional to 91.62, 138.14 and 90.48

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Solution

The fourth proportional to 91.62, 138.14 and 90.48 is: 136.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.62 : 138.14 = 90.48 : x
  2. Step 2: Convert to fraction form
    91.62/138.14 = 90.48/x
  3. Step 3: Cross multiply
    91.62x = 138.14 × 90.48
  4. Step 4: Simplify right side
    91.62x = 12,498.91
  5. Step 5: Solve for x
    x = 12,498.91/91.62
  6. Step 6: Final answer
    x = 136.42

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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.