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Finding the Fourth Proportional to 97.74, 134.91 and 91.58

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Solution

The fourth proportional to 97.74, 134.91 and 91.58 is: 126.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.74 : 134.91 = 91.58 : x
  2. Step 2: Convert to fraction form
    97.74/134.91 = 91.58/x
  3. Step 3: Cross multiply
    97.74x = 134.91 × 91.58
  4. Step 4: Simplify right side
    97.74x = 12,355.06
  5. Step 5: Solve for x
    x = 12,355.06/97.74
  6. Step 6: Final answer
    x = 126.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.