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Finding the Fourth Proportional to 88.13, 121.56 and 67.38

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Solution

The fourth proportional to 88.13, 121.56 and 67.38 is: 92.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.13 : 121.56 = 67.38 : x
  2. Step 2: Convert to fraction form
    88.13/121.56 = 67.38/x
  3. Step 3: Cross multiply
    88.13x = 121.56 × 67.38
  4. Step 4: Simplify right side
    88.13x = 8,190.71
  5. Step 5: Solve for x
    x = 8,190.71/88.13
  6. Step 6: Final answer
    x = 92.94

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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.