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Finding the Fourth Proportional to 91.74, 138.44 and 88.68

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Solution

The fourth proportional to 91.74, 138.44 and 88.68 is: 133.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.74 : 138.44 = 88.68 : x
  2. Step 2: Convert to fraction form
    91.74/138.44 = 88.68/x
  3. Step 3: Cross multiply
    91.74x = 138.44 × 88.68
  4. Step 4: Simplify right side
    91.74x = 12,277.08
  5. Step 5: Solve for x
    x = 12,277.08/91.74
  6. Step 6: Final answer
    x = 133.82

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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.