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Finding the Fourth Proportional to 97.55, 134.62 and 86.61

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Solution

The fourth proportional to 97.55, 134.62 and 86.61 is: 119.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.55 : 134.62 = 86.61 : x
  2. Step 2: Convert to fraction form
    97.55/134.62 = 86.61/x
  3. Step 3: Cross multiply
    97.55x = 134.62 × 86.61
  4. Step 4: Simplify right side
    97.55x = 11,659.22
  5. Step 5: Solve for x
    x = 11,659.22/97.55
  6. Step 6: Final answer
    x = 119.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.