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Finding the Fourth Proportional to 97.39, 146.16 and 86

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Solution

The fourth proportional to 97.39, 146.16 and 86 is: 129.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.39 : 146.16 = 86 : x
  2. Step 2: Convert to fraction form
    97.39/146.16 = 86/x
  3. Step 3: Cross multiply
    97.39x = 146.16 × 86
  4. Step 4: Simplify right side
    97.39x = 12,569.76
  5. Step 5: Solve for x
    x = 12,569.76/97.39
  6. Step 6: Final answer
    x = 129.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.