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Finding the Fourth Proportional to 139,324.80, 208,987.20 and 137,020.80

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Solution

The fourth proportional to 139,324.80, 208,987.20 and 137,020.80 is: 205,531.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,324.80 : 208,987.20 = 137,020.80 : x
  2. Step 2: Convert to fraction form
    139,324.80/208,987.20 = 137,020.80/x
  3. Step 3: Cross multiply
    139,324.80x = 208,987.20 × 137,020.80
  4. Step 4: Simplify right side
    139,324.80x = 28,635,593,333.76
  5. Step 5: Solve for x
    x = 28,635,593,333.76/139,324.80
  6. Step 6: Final answer
    x = 205,531.20

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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.