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Finding the Fourth Proportional to 88.92, 122.76 and 72.68

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Solution

The fourth proportional to 88.92, 122.76 and 72.68 is: 100.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.92 : 122.76 = 72.68 : x
  2. Step 2: Convert to fraction form
    88.92/122.76 = 72.68/x
  3. Step 3: Cross multiply
    88.92x = 122.76 × 72.68
  4. Step 4: Simplify right side
    88.92x = 8,921.58
  5. Step 5: Solve for x
    x = 8,921.58/88.92
  6. Step 6: Final answer
    x = 100.33

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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.