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Finding the Fourth Proportional to 138.24, 191.26 and 117.44

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Solution

The fourth proportional to 138.24, 191.26 and 117.44 is: 162.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.24 : 191.26 = 117.44 : x
  2. Step 2: Convert to fraction form
    138.24/191.26 = 117.44/x
  3. Step 3: Cross multiply
    138.24x = 191.26 × 117.44
  4. Step 4: Simplify right side
    138.24x = 22,461.57
  5. Step 5: Solve for x
    x = 22,461.57/138.24
  6. Step 6: Final answer
    x = 162.48

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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.