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Finding the Fourth Proportional to 88.81, 122.39 and 71.19

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Solution

The fourth proportional to 88.81, 122.39 and 71.19 is: 98.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.81 : 122.39 = 71.19 : x
  2. Step 2: Convert to fraction form
    88.81/122.39 = 71.19/x
  3. Step 3: Cross multiply
    88.81x = 122.39 × 71.19
  4. Step 4: Simplify right side
    88.81x = 8,712.94
  5. Step 5: Solve for x
    x = 8,712.94/88.81
  6. Step 6: Final answer
    x = 98.11

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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.