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Finding the Fourth Proportional to 138,031.20, 207,046.80 and 103,039.20

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Solution

The fourth proportional to 138,031.20, 207,046.80 and 103,039.20 is: 154,558.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,031.20 : 207,046.80 = 103,039.20 : x
  2. Step 2: Convert to fraction form
    138,031.20/207,046.80 = 103,039.20/x
  3. Step 3: Cross multiply
    138,031.20x = 207,046.80 × 103,039.20
  4. Step 4: Simplify right side
    138,031.20x = 21,333,936,634.56
  5. Step 5: Solve for x
    x = 21,333,936,634.56/138,031.20
  6. Step 6: Final answer
    x = 154,558.80

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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.