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Finding the Fourth Proportional to 88.43, 122.18 and 55.76

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Solution

The fourth proportional to 88.43, 122.18 and 55.76 is: 77.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.43 : 122.18 = 55.76 : x
  2. Step 2: Convert to fraction form
    88.43/122.18 = 55.76/x
  3. Step 3: Cross multiply
    88.43x = 122.18 × 55.76
  4. Step 4: Simplify right side
    88.43x = 6,811.87
  5. Step 5: Solve for x
    x = 6,811.87/88.43
  6. Step 6: Final answer
    x = 77.04

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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.