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Finding the Fourth Proportional to 138.48, 207.49 and 84.26

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Solution

The fourth proportional to 138.48, 207.49 and 84.26 is: 126.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.48 : 207.49 = 84.26 : x
  2. Step 2: Convert to fraction form
    138.48/207.49 = 84.26/x
  3. Step 3: Cross multiply
    138.48x = 207.49 × 84.26
  4. Step 4: Simplify right side
    138.48x = 17,483.11
  5. Step 5: Solve for x
    x = 17,483.11/138.48
  6. Step 6: Final answer
    x = 126.25

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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.