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Finding the Fourth Proportional to 97.48, 145.82 and 86.68

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Solution

The fourth proportional to 97.48, 145.82 and 86.68 is: 129.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.48 : 145.82 = 86.68 : x
  2. Step 2: Convert to fraction form
    97.48/145.82 = 86.68/x
  3. Step 3: Cross multiply
    97.48x = 145.82 × 86.68
  4. Step 4: Simplify right side
    97.48x = 12,639.68
  5. Step 5: Solve for x
    x = 12,639.68/97.48
  6. Step 6: Final answer
    x = 129.66

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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.