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Finding the Fourth Proportional to 66.40, 91.44 and 58.96

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Solution

The fourth proportional to 66.40, 91.44 and 58.96 is: 81.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.40 : 91.44 = 58.96 : x
  2. Step 2: Convert to fraction form
    66.40/91.44 = 58.96/x
  3. Step 3: Cross multiply
    66.40x = 91.44 × 58.96
  4. Step 4: Simplify right side
    66.40x = 5,391.30
  5. Step 5: Solve for x
    x = 5,391.30/66.40
  6. Step 6: Final answer
    x = 81.19

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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.