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Finding the Fourth Proportional to 138,638.40, 207,957.60 and 49,894.80

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Solution

The fourth proportional to 138,638.40, 207,957.60 and 49,894.80 is: 74,842.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,638.40 : 207,957.60 = 49,894.80 : x
  2. Step 2: Convert to fraction form
    138,638.40/207,957.60 = 49,894.80/x
  3. Step 3: Cross multiply
    138,638.40x = 207,957.60 × 49,894.80
  4. Step 4: Simplify right side
    138,638.40x = 10,376,002,860.48
  5. Step 5: Solve for x
    x = 10,376,002,860.48/138,638.40
  6. Step 6: Final answer
    x = 74,842.20

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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.