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Finding the Fourth Proportional to 88.86, 122.61 and 72.60

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Solution

The fourth proportional to 88.86, 122.61 and 72.60 is: 100.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.86 : 122.61 = 72.60 : x
  2. Step 2: Convert to fraction form
    88.86/122.61 = 72.60/x
  3. Step 3: Cross multiply
    88.86x = 122.61 × 72.60
  4. Step 4: Simplify right side
    88.86x = 8,901.49
  5. Step 5: Solve for x
    x = 8,901.49/88.86
  6. Step 6: Final answer
    x = 100.17

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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.