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Finding the Fourth Proportional to 412.52, 618.72 and 138.65

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Solution

The fourth proportional to 412.52, 618.72 and 138.65 is: 207.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.52 : 618.72 = 138.65 : x
  2. Step 2: Convert to fraction form
    412.52/618.72 = 138.65/x
  3. Step 3: Cross multiply
    412.52x = 618.72 × 138.65
  4. Step 4: Simplify right side
    412.52x = 85,785.53
  5. Step 5: Solve for x
    x = 85,785.53/412.52
  6. Step 6: Final answer
    x = 207.95

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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.