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Finding the Fourth Proportional to 66.96, 100.51 and 61.16

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Solution

The fourth proportional to 66.96, 100.51 and 61.16 is: 91.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.96 : 100.51 = 61.16 : x
  2. Step 2: Convert to fraction form
    66.96/100.51 = 61.16/x
  3. Step 3: Cross multiply
    66.96x = 100.51 × 61.16
  4. Step 4: Simplify right side
    66.96x = 6,146.54
  5. Step 5: Solve for x
    x = 6,146.54/66.96
  6. Step 6: Final answer
    x = 91.79

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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.