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Finding the Fourth Proportional to 54,138.60, 81,207.90 and 51,805.80

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Solution

The fourth proportional to 54,138.60, 81,207.90 and 51,805.80 is: 77,708.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,138.60 : 81,207.90 = 51,805.80 : x
  2. Step 2: Convert to fraction form
    54,138.60/81,207.90 = 51,805.80/x
  3. Step 3: Cross multiply
    54,138.60x = 81,207.90 × 51,805.80
  4. Step 4: Simplify right side
    54,138.60x = 4,207,040,225.82
  5. Step 5: Solve for x
    x = 4,207,040,225.82/54,138.60
  6. Step 6: Final answer
    x = 77,708.70

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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.