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Finding the Fourth Proportional to 111.93, 154.53 and 85.66

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Solution

The fourth proportional to 111.93, 154.53 and 85.66 is: 118.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.93 : 154.53 = 85.66 : x
  2. Step 2: Convert to fraction form
    111.93/154.53 = 85.66/x
  3. Step 3: Cross multiply
    111.93x = 154.53 × 85.66
  4. Step 4: Simplify right side
    111.93x = 13,236.89
  5. Step 5: Solve for x
    x = 13,236.89/111.93
  6. Step 6: Final answer
    x = 118.26

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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.