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Finding the Fourth Proportional to 138,008.80, 207,134.70 and 81,778.60

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Solution

The fourth proportional to 138,008.80, 207,134.70 and 81,778.60 is: 122,739.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,008.80 : 207,134.70 = 81,778.60 : x
  2. Step 2: Convert to fraction form
    138,008.80/207,134.70 = 81,778.60/x
  3. Step 3: Cross multiply
    138,008.80x = 207,134.70 × 81,778.60
  4. Step 4: Simplify right side
    138,008.80x = 16,939,185,777.42
  5. Step 5: Solve for x
    x = 16,939,185,777.42/138,008.80
  6. Step 6: Final answer
    x = 122,739.90

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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.