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Finding the Fourth Proportional to 412.50, 618.51 and 138.43

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Solution

The fourth proportional to 412.50, 618.51 and 138.43 is: 207.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.50 : 618.51 = 138.43 : x
  2. Step 2: Convert to fraction form
    412.50/618.51 = 138.43/x
  3. Step 3: Cross multiply
    412.50x = 618.51 × 138.43
  4. Step 4: Simplify right side
    412.50x = 85,620.34
  5. Step 5: Solve for x
    x = 85,620.34/412.50
  6. Step 6: Final answer
    x = 207.56

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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.