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Finding the Fourth Proportional to 138,873.60, 208,310.40 and 45,388.80

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Solution

The fourth proportional to 138,873.60, 208,310.40 and 45,388.80 is: 68,083.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,873.60 : 208,310.40 = 45,388.80 : x
  2. Step 2: Convert to fraction form
    138,873.60/208,310.40 = 45,388.80/x
  3. Step 3: Cross multiply
    138,873.60x = 208,310.40 × 45,388.80
  4. Step 4: Simplify right side
    138,873.60x = 9,454,959,083.52
  5. Step 5: Solve for x
    x = 9,454,959,083.52/138,873.60
  6. Step 6: Final answer
    x = 68,083.20

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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.