Home / 138,860.20-208,355.10-72,375.40

Finding the Fourth Proportional to 138,860.20, 208,355.10 and 72,375.40

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Solution

The fourth proportional to 138,860.20, 208,355.10 and 72,375.40 is: 108,596.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,860.20 : 208,355.10 = 72,375.40 : x
  2. Step 2: Convert to fraction form
    138,860.20/208,355.10 = 72,375.40/x
  3. Step 3: Cross multiply
    138,860.20x = 208,355.10 × 72,375.40
  4. Step 4: Simplify right side
    138,860.20x = 15,079,783,704.54
  5. Step 5: Solve for x
    x = 15,079,783,704.54/138,860.20
  6. Step 6: Final answer
    x = 108,596.87

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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.