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Finding the Fourth Proportional to 170.24, 255.28 and 138.08

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Solution

The fourth proportional to 170.24, 255.28 and 138.08 is: 207.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.24 : 255.28 = 138.08 : x
  2. Step 2: Convert to fraction form
    170.24/255.28 = 138.08/x
  3. Step 3: Cross multiply
    170.24x = 255.28 × 138.08
  4. Step 4: Simplify right side
    170.24x = 35,249.06
  5. Step 5: Solve for x
    x = 35,249.06/170.24
  6. Step 6: Final answer
    x = 207.06

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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.