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Finding the Fourth Proportional to 131,976.80, 197,696.40 and 81,903.20

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Solution

The fourth proportional to 131,976.80, 197,696.40 and 81,903.20 is: 122,687.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,976.80 : 197,696.40 = 81,903.20 : x
  2. Step 2: Convert to fraction form
    131,976.80/197,696.40 = 81,903.20/x
  3. Step 3: Cross multiply
    131,976.80x = 197,696.40 × 81,903.20
  4. Step 4: Simplify right side
    131,976.80x = 16,191,967,788.48
  5. Step 5: Solve for x
    x = 16,191,967,788.48/131,976.80
  6. Step 6: Final answer
    x = 122,687.99

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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.