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Finding the Fourth Proportional to 66.69, 100.02 and 30.61

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Solution

The fourth proportional to 66.69, 100.02 and 30.61 is: 45.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.69 : 100.02 = 30.61 : x
  2. Step 2: Convert to fraction form
    66.69/100.02 = 30.61/x
  3. Step 3: Cross multiply
    66.69x = 100.02 × 30.61
  4. Step 4: Simplify right side
    66.69x = 3,061.61
  5. Step 5: Solve for x
    x = 3,061.61/66.69
  6. Step 6: Final answer
    x = 45.91

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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.