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Finding the Fourth Proportional to 111.27, 153.53 and 71.94

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Solution

The fourth proportional to 111.27, 153.53 and 71.94 is: 99.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.27 : 153.53 = 71.94 : x
  2. Step 2: Convert to fraction form
    111.27/153.53 = 71.94/x
  3. Step 3: Cross multiply
    111.27x = 153.53 × 71.94
  4. Step 4: Simplify right side
    111.27x = 11,044.95
  5. Step 5: Solve for x
    x = 11,044.95/111.27
  6. Step 6: Final answer
    x = 99.26

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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.