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Finding the Fourth Proportional to 97.56, 145.53 and 86.82

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Solution

The fourth proportional to 97.56, 145.53 and 86.82 is: 129.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.56 : 145.53 = 86.82 : x
  2. Step 2: Convert to fraction form
    97.56/145.53 = 86.82/x
  3. Step 3: Cross multiply
    97.56x = 145.53 × 86.82
  4. Step 4: Simplify right side
    97.56x = 12,634.91
  5. Step 5: Solve for x
    x = 12,634.91/97.56
  6. Step 6: Final answer
    x = 129.51

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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.