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Finding the Fourth Proportional to 138,871.20, 207,087.36 and 137,608.20

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Solution

The fourth proportional to 138,871.20, 207,087.36 and 137,608.20 is: 205,203.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,871.20 : 207,087.36 = 137,608.20 : x
  2. Step 2: Convert to fraction form
    138,871.20/207,087.36 = 137,608.20/x
  3. Step 3: Cross multiply
    138,871.20x = 207,087.36 × 137,608.20
  4. Step 4: Simplify right side
    138,871.20x = 28,496,918,852.35
  5. Step 5: Solve for x
    x = 28,496,918,852.35/138,871.20
  6. Step 6: Final answer
    x = 205,203.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.