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Finding the Fourth Proportional to 97.12, 145.55 and 66.61

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Solution

The fourth proportional to 97.12, 145.55 and 66.61 is: 99.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.12 : 145.55 = 66.61 : x
  2. Step 2: Convert to fraction form
    97.12/145.55 = 66.61/x
  3. Step 3: Cross multiply
    97.12x = 145.55 × 66.61
  4. Step 4: Simplify right side
    97.12x = 9,694.02
  5. Step 5: Solve for x
    x = 9,694.02/97.12
  6. Step 6: Final answer
    x = 99.82

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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.