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Finding the Fourth Proportional to 111.17, 153.22 and 74.31

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Solution

The fourth proportional to 111.17, 153.22 and 74.31 is: 102.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.17 : 153.22 = 74.31 : x
  2. Step 2: Convert to fraction form
    111.17/153.22 = 74.31/x
  3. Step 3: Cross multiply
    111.17x = 153.22 × 74.31
  4. Step 4: Simplify right side
    111.17x = 11,386.06
  5. Step 5: Solve for x
    x = 11,386.06/111.17
  6. Step 6: Final answer
    x = 102.42

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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.