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Finding the Fourth Proportional to 412.11, 618.17 and 138.47

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Solution

The fourth proportional to 412.11, 618.17 and 138.47 is: 207.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.11 : 618.17 = 138.47 : x
  2. Step 2: Convert to fraction form
    412.11/618.17 = 138.47/x
  3. Step 3: Cross multiply
    412.11x = 618.17 × 138.47
  4. Step 4: Simplify right side
    412.11x = 85,594.22
  5. Step 5: Solve for x
    x = 85,594.22/412.11
  6. Step 6: Final answer
    x = 207.70

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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.