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Finding the Fourth Proportional to 97.17, 144.95 and 86.91

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Solution

The fourth proportional to 97.17, 144.95 and 86.91 is: 129.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.17 : 144.95 = 86.91 : x
  2. Step 2: Convert to fraction form
    97.17/144.95 = 86.91/x
  3. Step 3: Cross multiply
    97.17x = 144.95 × 86.91
  4. Step 4: Simplify right side
    97.17x = 12,597.60
  5. Step 5: Solve for x
    x = 12,597.60/97.17
  6. Step 6: Final answer
    x = 129.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.