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Finding the Fourth Proportional to 88.17, 121.55 and 76.47

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Solution

The fourth proportional to 88.17, 121.55 and 76.47 is: 105.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.17 : 121.55 = 76.47 : x
  2. Step 2: Convert to fraction form
    88.17/121.55 = 76.47/x
  3. Step 3: Cross multiply
    88.17x = 121.55 × 76.47
  4. Step 4: Simplify right side
    88.17x = 9,294.55
  5. Step 5: Solve for x
    x = 9,294.55/88.17
  6. Step 6: Final answer
    x = 105.42

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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.