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Finding the Fourth Proportional to 92.20, 138.36 and 91.48

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Solution

The fourth proportional to 92.20, 138.36 and 91.48 is: 137.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.20 : 138.36 = 91.48 : x
  2. Step 2: Convert to fraction form
    92.20/138.36 = 91.48/x
  3. Step 3: Cross multiply
    92.20x = 138.36 × 91.48
  4. Step 4: Simplify right side
    92.20x = 12,657.17
  5. Step 5: Solve for x
    x = 12,657.17/92.20
  6. Step 6: Final answer
    x = 137.28

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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.