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Finding the Fourth Proportional to 412.07, 618.26 and 138.15

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Solution

The fourth proportional to 412.07, 618.26 and 138.15 is: 207.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.07 : 618.26 = 138.15 : x
  2. Step 2: Convert to fraction form
    412.07/618.26 = 138.15/x
  3. Step 3: Cross multiply
    412.07x = 618.26 × 138.15
  4. Step 4: Simplify right side
    412.07x = 85,411.93
  5. Step 5: Solve for x
    x = 85,411.93/412.07
  6. Step 6: Final answer
    x = 207.28

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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.