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Finding the Fourth Proportional to 97.98, 147.70 and 91.71

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Solution

The fourth proportional to 97.98, 147.70 and 91.71 is: 138.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.98 : 147.70 = 91.71 : x
  2. Step 2: Convert to fraction form
    97.98/147.70 = 91.71/x
  3. Step 3: Cross multiply
    97.98x = 147.70 × 91.71
  4. Step 4: Simplify right side
    97.98x = 13,545.57
  5. Step 5: Solve for x
    x = 13,545.57/97.98
  6. Step 6: Final answer
    x = 138.25

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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.