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Finding the Fourth Proportional to 138,007.80, 207,133.20 and 81,777.60

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Solution

The fourth proportional to 138,007.80, 207,133.20 and 81,777.60 is: 122,738.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,007.80 : 207,133.20 = 81,777.60 : x
  2. Step 2: Convert to fraction form
    138,007.80/207,133.20 = 81,777.60/x
  3. Step 3: Cross multiply
    138,007.80x = 207,133.20 × 81,777.60
  4. Step 4: Simplify right side
    138,007.80x = 16,938,855,976.32
  5. Step 5: Solve for x
    x = 16,938,855,976.32/138,007.80
  6. Step 6: Final answer
    x = 122,738.40

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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.