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Finding the Fourth Proportional to 138,256.90, 207,053.13 and 78,912.66

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Solution

The fourth proportional to 138,256.90, 207,053.13 and 78,912.66 is: 118,179.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,256.90 : 207,053.13 = 78,912.66 : x
  2. Step 2: Convert to fraction form
    138,256.90/207,053.13 = 78,912.66/x
  3. Step 3: Cross multiply
    138,256.90x = 207,053.13 × 78,912.66
  4. Step 4: Simplify right side
    138,256.90x = 16,339,113,249.63
  5. Step 5: Solve for x
    x = 16,339,113,249.63/138,256.90
  6. Step 6: Final answer
    x = 118,179.37

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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.