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Finding the Fourth Proportional to 66.49, 91.74 and 38.86

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Solution

The fourth proportional to 66.49, 91.74 and 38.86 is: 53.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.49 : 91.74 = 38.86 : x
  2. Step 2: Convert to fraction form
    66.49/91.74 = 38.86/x
  3. Step 3: Cross multiply
    66.49x = 91.74 × 38.86
  4. Step 4: Simplify right side
    66.49x = 3,565.02
  5. Step 5: Solve for x
    x = 3,565.02/66.49
  6. Step 6: Final answer
    x = 53.62

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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.