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Finding the Fourth Proportional to 66.54, 91.82 and 38.93

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Solution

The fourth proportional to 66.54, 91.82 and 38.93 is: 53.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.54 : 91.82 = 38.93 : x
  2. Step 2: Convert to fraction form
    66.54/91.82 = 38.93/x
  3. Step 3: Cross multiply
    66.54x = 91.82 × 38.93
  4. Step 4: Simplify right side
    66.54x = 3,574.19
  5. Step 5: Solve for x
    x = 3,574.19/66.54
  6. Step 6: Final answer
    x = 53.71

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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.