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Finding the Fourth Proportional to 138,138.95, 206,937.45 and 71,622.56

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Solution

The fourth proportional to 138,138.95, 206,937.45 and 71,622.56 is: 107,293.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,138.95 : 206,937.45 = 71,622.56 : x
  2. Step 2: Convert to fraction form
    138,138.95/206,937.45 = 71,622.56/x
  3. Step 3: Cross multiply
    138,138.95x = 206,937.45 × 71,622.56
  4. Step 4: Simplify right side
    138,138.95x = 14,821,388,894.18
  5. Step 5: Solve for x
    x = 14,821,388,894.18/138,138.95
  6. Step 6: Final answer
    x = 107,293.34

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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.