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Finding the Fourth Proportional to 66.16, 91.20 and 57.96

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Solution

The fourth proportional to 66.16, 91.20 and 57.96 is: 79.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.16 : 91.20 = 57.96 : x
  2. Step 2: Convert to fraction form
    66.16/91.20 = 57.96/x
  3. Step 3: Cross multiply
    66.16x = 91.20 × 57.96
  4. Step 4: Simplify right side
    66.16x = 5,285.95
  5. Step 5: Solve for x
    x = 5,285.95/66.16
  6. Step 6: Final answer
    x = 79.90

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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.