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Finding the Fourth Proportional to 92.90, 138.61 and 89.66

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Solution

The fourth proportional to 92.90, 138.61 and 89.66 is: 133.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.90 : 138.61 = 89.66 : x
  2. Step 2: Convert to fraction form
    92.90/138.61 = 89.66/x
  3. Step 3: Cross multiply
    92.90x = 138.61 × 89.66
  4. Step 4: Simplify right side
    92.90x = 12,427.77
  5. Step 5: Solve for x
    x = 12,427.77/92.90
  6. Step 6: Final answer
    x = 133.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.