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Finding the Fourth Proportional to 66.62, 91.94 and 38.99

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Solution

The fourth proportional to 66.62, 91.94 and 38.99 is: 53.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.62 : 91.94 = 38.99 : x
  2. Step 2: Convert to fraction form
    66.62/91.94 = 38.99/x
  3. Step 3: Cross multiply
    66.62x = 91.94 × 38.99
  4. Step 4: Simplify right side
    66.62x = 3,585.15
  5. Step 5: Solve for x
    x = 3,585.15/66.62
  6. Step 6: Final answer
    x = 53.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.