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Finding the Fourth Proportional to 169.40, 233.78 and 111.21

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Solution

The fourth proportional to 169.40, 233.78 and 111.21 is: 153.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.40 : 233.78 = 111.21 : x
  2. Step 2: Convert to fraction form
    169.40/233.78 = 111.21/x
  3. Step 3: Cross multiply
    169.40x = 233.78 × 111.21
  4. Step 4: Simplify right side
    169.40x = 25,998.12
  5. Step 5: Solve for x
    x = 25,998.12/169.40
  6. Step 6: Final answer
    x = 153.48

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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.