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Finding the Fourth Proportional to 111.48, 154.02 and 85.36

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Solution

The fourth proportional to 111.48, 154.02 and 85.36 is: 117.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.48 : 154.02 = 85.36 : x
  2. Step 2: Convert to fraction form
    111.48/154.02 = 85.36/x
  3. Step 3: Cross multiply
    111.48x = 154.02 × 85.36
  4. Step 4: Simplify right side
    111.48x = 13,147.15
  5. Step 5: Solve for x
    x = 13,147.15/111.48
  6. Step 6: Final answer
    x = 117.93

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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.