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Finding the Fourth Proportional to 158.40, 218.73 and 111.87

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Solution

The fourth proportional to 158.40, 218.73 and 111.87 is: 154.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.40 : 218.73 = 111.87 : x
  2. Step 2: Convert to fraction form
    158.40/218.73 = 111.87/x
  3. Step 3: Cross multiply
    158.40x = 218.73 × 111.87
  4. Step 4: Simplify right side
    158.40x = 24,469.33
  5. Step 5: Solve for x
    x = 24,469.33/158.40
  6. Step 6: Final answer
    x = 154.48

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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.