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Finding the Fourth Proportional to 66.31, 91.56 and 41.79

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Solution

The fourth proportional to 66.31, 91.56 and 41.79 is: 57.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.31 : 91.56 = 41.79 : x
  2. Step 2: Convert to fraction form
    66.31/91.56 = 41.79/x
  3. Step 3: Cross multiply
    66.31x = 91.56 × 41.79
  4. Step 4: Simplify right side
    66.31x = 3,826.29
  5. Step 5: Solve for x
    x = 3,826.29/66.31
  6. Step 6: Final answer
    x = 57.70

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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.