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Finding the Fourth Proportional to 97.57, 147.09 and 90.97

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Solution

The fourth proportional to 97.57, 147.09 and 90.97 is: 137.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.57 : 147.09 = 90.97 : x
  2. Step 2: Convert to fraction form
    97.57/147.09 = 90.97/x
  3. Step 3: Cross multiply
    97.57x = 147.09 × 90.97
  4. Step 4: Simplify right side
    97.57x = 13,380.58
  5. Step 5: Solve for x
    x = 13,380.58/97.57
  6. Step 6: Final answer
    x = 137.13

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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.