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Finding the Fourth Proportional to 111.08, 153.31 and 101.86

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Solution

The fourth proportional to 111.08, 153.31 and 101.86 is: 140.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.08 : 153.31 = 101.86 : x
  2. Step 2: Convert to fraction form
    111.08/153.31 = 101.86/x
  3. Step 3: Cross multiply
    111.08x = 153.31 × 101.86
  4. Step 4: Simplify right side
    111.08x = 15,615.14
  5. Step 5: Solve for x
    x = 15,615.14/111.08
  6. Step 6: Final answer
    x = 140.58

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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.