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Finding the Fourth Proportional to 97.47, 145.77 and 86.71

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Solution

The fourth proportional to 97.47, 145.77 and 86.71 is: 129.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.47 : 145.77 = 86.71 : x
  2. Step 2: Convert to fraction form
    97.47/145.77 = 86.71/x
  3. Step 3: Cross multiply
    97.47x = 145.77 × 86.71
  4. Step 4: Simplify right side
    97.47x = 12,639.67
  5. Step 5: Solve for x
    x = 12,639.67/97.47
  6. Step 6: Final answer
    x = 129.68

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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.