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Finding the Fourth Proportional to 66.15, 99.15 and 31.95

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Solution

The fourth proportional to 66.15, 99.15 and 31.95 is: 47.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.15 : 99.15 = 31.95 : x
  2. Step 2: Convert to fraction form
    66.15/99.15 = 31.95/x
  3. Step 3: Cross multiply
    66.15x = 99.15 × 31.95
  4. Step 4: Simplify right side
    66.15x = 3,167.84
  5. Step 5: Solve for x
    x = 3,167.84/66.15
  6. Step 6: Final answer
    x = 47.89

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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.