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Finding the Fourth Proportional to 66.38, 91.54 and 41.77

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Solution

The fourth proportional to 66.38, 91.54 and 41.77 is: 57.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.38 : 91.54 = 41.77 : x
  2. Step 2: Convert to fraction form
    66.38/91.54 = 41.77/x
  3. Step 3: Cross multiply
    66.38x = 91.54 × 41.77
  4. Step 4: Simplify right side
    66.38x = 3,823.63
  5. Step 5: Solve for x
    x = 3,823.63/66.38
  6. Step 6: Final answer
    x = 57.60

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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.