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Finding the Fourth Proportional to 138,340.80, 207,511.20 and 126,093.60

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Solution

The fourth proportional to 138,340.80, 207,511.20 and 126,093.60 is: 189,140.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,340.80 : 207,511.20 = 126,093.60 : x
  2. Step 2: Convert to fraction form
    138,340.80/207,511.20 = 126,093.60/x
  3. Step 3: Cross multiply
    138,340.80x = 207,511.20 × 126,093.60
  4. Step 4: Simplify right side
    138,340.80x = 26,165,834,248.32
  5. Step 5: Solve for x
    x = 26,165,834,248.32/138,340.80
  6. Step 6: Final answer
    x = 189,140.40

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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.