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Finding the Fourth Proportional to 66.39, 91.63 and 38.75

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Solution

The fourth proportional to 66.39, 91.63 and 38.75 is: 53.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.39 : 91.63 = 38.75 : x
  2. Step 2: Convert to fraction form
    66.39/91.63 = 38.75/x
  3. Step 3: Cross multiply
    66.39x = 91.63 × 38.75
  4. Step 4: Simplify right side
    66.39x = 3,550.25
  5. Step 5: Solve for x
    x = 3,550.25/66.39
  6. Step 6: Final answer
    x = 53.48

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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.