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Finding the Fourth Proportional to 82.87, 124.21 and 55.96

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Solution

The fourth proportional to 82.87, 124.21 and 55.96 is: 83.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.87 : 124.21 = 55.96 : x
  2. Step 2: Convert to fraction form
    82.87/124.21 = 55.96/x
  3. Step 3: Cross multiply
    82.87x = 124.21 × 55.96
  4. Step 4: Simplify right side
    82.87x = 6,950.79
  5. Step 5: Solve for x
    x = 6,950.79/82.87
  6. Step 6: Final answer
    x = 83.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.