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Finding the Fourth Proportional to 169.14, 253.38 and 138.75

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Solution

The fourth proportional to 169.14, 253.38 and 138.75 is: 207.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.14 : 253.38 = 138.75 : x
  2. Step 2: Convert to fraction form
    169.14/253.38 = 138.75/x
  3. Step 3: Cross multiply
    169.14x = 253.38 × 138.75
  4. Step 4: Simplify right side
    169.14x = 35,156.48
  5. Step 5: Solve for x
    x = 35,156.48/169.14
  6. Step 6: Final answer
    x = 207.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.