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Finding the Fourth Proportional to 88.58, 133.61 and 87.69

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Solution

The fourth proportional to 88.58, 133.61 and 87.69 is: 132.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.58 : 133.61 = 87.69 : x
  2. Step 2: Convert to fraction form
    88.58/133.61 = 87.69/x
  3. Step 3: Cross multiply
    88.58x = 133.61 × 87.69
  4. Step 4: Simplify right side
    88.58x = 11,716.19
  5. Step 5: Solve for x
    x = 11,716.19/88.58
  6. Step 6: Final answer
    x = 132.27

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.