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Finding the Fourth Proportional to 88.17, 121.71 and 81.58

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Solution

The fourth proportional to 88.17, 121.71 and 81.58 is: 112.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.17 : 121.71 = 81.58 : x
  2. Step 2: Convert to fraction form
    88.17/121.71 = 81.58/x
  3. Step 3: Cross multiply
    88.17x = 121.71 × 81.58
  4. Step 4: Simplify right side
    88.17x = 9,929.10
  5. Step 5: Solve for x
    x = 9,929.10/88.17
  6. Step 6: Final answer
    x = 112.61

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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.