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Finding the Fourth Proportional to 66.11, 99.06 and 31.82

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Solution

The fourth proportional to 66.11, 99.06 and 31.82 is: 47.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.11 : 99.06 = 31.82 : x
  2. Step 2: Convert to fraction form
    66.11/99.06 = 31.82/x
  3. Step 3: Cross multiply
    66.11x = 99.06 × 31.82
  4. Step 4: Simplify right side
    66.11x = 3,151.59
  5. Step 5: Solve for x
    x = 3,151.59/66.11
  6. Step 6: Final answer
    x = 47.68

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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.