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Finding the Fourth Proportional to 138,003.40, 206,486.70 and 125,561.80

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Solution

The fourth proportional to 138,003.40, 206,486.70 and 125,561.80 is: 187,871.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,003.40 : 206,486.70 = 125,561.80 : x
  2. Step 2: Convert to fraction form
    138,003.40/206,486.70 = 125,561.80/x
  3. Step 3: Cross multiply
    138,003.40x = 206,486.70 × 125,561.80
  4. Step 4: Simplify right side
    138,003.40x = 25,926,841,728.06
  5. Step 5: Solve for x
    x = 25,926,841,728.06/138,003.40
  6. Step 6: Final answer
    x = 187,871.04

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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.