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Finding the Fourth Proportional to 88.27, 121.99 and 72.71

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Solution

The fourth proportional to 88.27, 121.99 and 72.71 is: 100.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.27 : 121.99 = 72.71 : x
  2. Step 2: Convert to fraction form
    88.27/121.99 = 72.71/x
  3. Step 3: Cross multiply
    88.27x = 121.99 × 72.71
  4. Step 4: Simplify right side
    88.27x = 8,869.89
  5. Step 5: Solve for x
    x = 8,869.89/88.27
  6. Step 6: Final answer
    x = 100.49

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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.