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Finding the Fourth Proportional to 97.95, 147.66 and 91.34

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Solution

The fourth proportional to 97.95, 147.66 and 91.34 is: 137.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.95 : 147.66 = 91.34 : x
  2. Step 2: Convert to fraction form
    97.95/147.66 = 91.34/x
  3. Step 3: Cross multiply
    97.95x = 147.66 × 91.34
  4. Step 4: Simplify right side
    97.95x = 13,487.41
  5. Step 5: Solve for x
    x = 13,487.41/97.95
  6. Step 6: Final answer
    x = 137.70

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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.