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Finding the Fourth Proportional to 88.52, 121.44 and 85.79

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Solution

The fourth proportional to 88.52, 121.44 and 85.79 is: 117.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.52 : 121.44 = 85.79 : x
  2. Step 2: Convert to fraction form
    88.52/121.44 = 85.79/x
  3. Step 3: Cross multiply
    88.52x = 121.44 × 85.79
  4. Step 4: Simplify right side
    88.52x = 10,417.73
  5. Step 5: Solve for x
    x = 10,417.73/88.52
  6. Step 6: Final answer
    x = 117.69

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.