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Finding the Fourth Proportional to 89,115.20, 133,672.80 and 54,036.80

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Solution

The fourth proportional to 89,115.20, 133,672.80 and 54,036.80 is: 81,055.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,115.20 : 133,672.80 = 54,036.80 : x
  2. Step 2: Convert to fraction form
    89,115.20/133,672.80 = 54,036.80/x
  3. Step 3: Cross multiply
    89,115.20x = 133,672.80 × 54,036.80
  4. Step 4: Simplify right side
    89,115.20x = 7,223,250,359.04
  5. Step 5: Solve for x
    x = 7,223,250,359.04/89,115.20
  6. Step 6: Final answer
    x = 81,055.20

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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.