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Finding the Fourth Proportional to 412.59, 618.66 and 138.54

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Solution

The fourth proportional to 412.59, 618.66 and 138.54 is: 207.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.59 : 618.66 = 138.54 : x
  2. Step 2: Convert to fraction form
    412.59/618.66 = 138.54/x
  3. Step 3: Cross multiply
    412.59x = 618.66 × 138.54
  4. Step 4: Simplify right side
    412.59x = 85,709.16
  5. Step 5: Solve for x
    x = 85,709.16/412.59
  6. Step 6: Final answer
    x = 207.73

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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.