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Finding the Fourth Proportional to 87.80, 121.16 and 48.46

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Solution

The fourth proportional to 87.80, 121.16 and 48.46 is: 66.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.80 : 121.16 = 48.46 : x
  2. Step 2: Convert to fraction form
    87.80/121.16 = 48.46/x
  3. Step 3: Cross multiply
    87.80x = 121.16 × 48.46
  4. Step 4: Simplify right side
    87.80x = 5,870.78
  5. Step 5: Solve for x
    x = 5,870.78/87.80
  6. Step 6: Final answer
    x = 66.86

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.