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Finding the Fourth Proportional to 138,122.88, 207,184.30 and 91,364.82

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Solution

The fourth proportional to 138,122.88, 207,184.30 and 91,364.82 is: 137,047.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,122.88 : 207,184.30 = 91,364.82 : x
  2. Step 2: Convert to fraction form
    138,122.88/207,184.30 = 91,364.82/x
  3. Step 3: Cross multiply
    138,122.88x = 207,184.30 × 91,364.82
  4. Step 4: Simplify right side
    138,122.88x = 18,929,356,276.33
  5. Step 5: Solve for x
    x = 18,929,356,276.33/138,122.88
  6. Step 6: Final answer
    x = 137,047.22

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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.