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Finding the Fourth Proportional to 87.78, 121.14 and 52.83

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Solution

The fourth proportional to 87.78, 121.14 and 52.83 is: 72.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.78 : 121.14 = 52.83 : x
  2. Step 2: Convert to fraction form
    87.78/121.14 = 52.83/x
  3. Step 3: Cross multiply
    87.78x = 121.14 × 52.83
  4. Step 4: Simplify right side
    87.78x = 6,399.56
  5. Step 5: Solve for x
    x = 6,399.56/87.78
  6. Step 6: Final answer
    x = 72.90

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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.