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Finding the Fourth Proportional to 131,679.60, 197,260.20 and 78,932.40

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Solution

The fourth proportional to 131,679.60, 197,260.20 and 78,932.40 is: 118,243.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,679.60 : 197,260.20 = 78,932.40 : x
  2. Step 2: Convert to fraction form
    131,679.60/197,260.20 = 78,932.40/x
  3. Step 3: Cross multiply
    131,679.60x = 197,260.20 × 78,932.40
  4. Step 4: Simplify right side
    131,679.60x = 15,570,221,010.48
  5. Step 5: Solve for x
    x = 15,570,221,010.48/131,679.60
  6. Step 6: Final answer
    x = 118,243.23

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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.