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Finding the Fourth Proportional to 138,340.80, 207,381.60 and 108,338.40

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Solution

The fourth proportional to 138,340.80, 207,381.60 and 108,338.40 is: 162,406.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,340.80 : 207,381.60 = 108,338.40 : x
  2. Step 2: Convert to fraction form
    138,340.80/207,381.60 = 108,338.40/x
  3. Step 3: Cross multiply
    138,340.80x = 207,381.60 × 108,338.40
  4. Step 4: Simplify right side
    138,340.80x = 22,467,390,733.44
  5. Step 5: Solve for x
    x = 22,467,390,733.44/138,340.80
  6. Step 6: Final answer
    x = 162,406.11

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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.