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Finding the Fourth Proportional to 131,112.40, 196,814.40 and 81,248.80

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Solution

The fourth proportional to 131,112.40, 196,814.40 and 81,248.80 is: 121,963.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,112.40 : 196,814.40 = 81,248.80 : x
  2. Step 2: Convert to fraction form
    131,112.40/196,814.40 = 81,248.80/x
  3. Step 3: Cross multiply
    131,112.40x = 196,814.40 × 81,248.80
  4. Step 4: Simplify right side
    131,112.40x = 15,990,933,822.72
  5. Step 5: Solve for x
    x = 15,990,933,822.72/131,112.40
  6. Step 6: Final answer
    x = 121,963.55

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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.