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Finding the Fourth Proportional to 111.58, 154.08 and 93.91

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Solution

The fourth proportional to 111.58, 154.08 and 93.91 is: 129.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.58 : 154.08 = 93.91 : x
  2. Step 2: Convert to fraction form
    111.58/154.08 = 93.91/x
  3. Step 3: Cross multiply
    111.58x = 154.08 × 93.91
  4. Step 4: Simplify right side
    111.58x = 14,469.65
  5. Step 5: Solve for x
    x = 14,469.65/111.58
  6. Step 6: Final answer
    x = 129.68

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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.