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Finding the Fourth Proportional to 218.92, 328.66 and 138.10

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Solution

The fourth proportional to 218.92, 328.66 and 138.10 is: 207.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.92 : 328.66 = 138.10 : x
  2. Step 2: Convert to fraction form
    218.92/328.66 = 138.10/x
  3. Step 3: Cross multiply
    218.92x = 328.66 × 138.10
  4. Step 4: Simplify right side
    218.92x = 45,387.95
  5. Step 5: Solve for x
    x = 45,387.95/218.92
  6. Step 6: Final answer
    x = 207.33

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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.