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Finding the Fourth Proportional to 88.53, 121.91 and 76.86

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Solution

The fourth proportional to 88.53, 121.91 and 76.86 is: 105.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.53 : 121.91 = 76.86 : x
  2. Step 2: Convert to fraction form
    88.53/121.91 = 76.86/x
  3. Step 3: Cross multiply
    88.53x = 121.91 × 76.86
  4. Step 4: Simplify right side
    88.53x = 9,369.62
  5. Step 5: Solve for x
    x = 9,369.62/88.53
  6. Step 6: Final answer
    x = 105.84

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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.