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Finding the Fourth Proportional to 88.39, 121.70 and 82.42

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Solution

The fourth proportional to 88.39, 121.70 and 82.42 is: 113.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.39 : 121.70 = 82.42 : x
  2. Step 2: Convert to fraction form
    88.39/121.70 = 82.42/x
  3. Step 3: Cross multiply
    88.39x = 121.70 × 82.42
  4. Step 4: Simplify right side
    88.39x = 10,030.42
  5. Step 5: Solve for x
    x = 10,030.42/88.39
  6. Step 6: Final answer
    x = 113.48

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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.