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Finding the Fourth Proportional to 54,581.90, 81,876.64 and 21,290.90

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Solution

The fourth proportional to 54,581.90, 81,876.64 and 21,290.90 is: 31,937.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,581.90 : 81,876.64 = 21,290.90 : x
  2. Step 2: Convert to fraction form
    54,581.90/81,876.64 = 21,290.90/x
  3. Step 3: Cross multiply
    54,581.90x = 81,876.64 × 21,290.90
  4. Step 4: Simplify right side
    54,581.90x = 1,743,227,354.58
  5. Step 5: Solve for x
    x = 1,743,227,354.58/54,581.90
  6. Step 6: Final answer
    x = 31,937.83

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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.