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Finding the Fourth Proportional to 54,279.20, 81,433.20 and 19,215.20

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Solution

The fourth proportional to 54,279.20, 81,433.20 and 19,215.20 is: 28,827.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,279.20 : 81,433.20 = 19,215.20 : x
  2. Step 2: Convert to fraction form
    54,279.20/81,433.20 = 19,215.20/x
  3. Step 3: Cross multiply
    54,279.20x = 81,433.20 × 19,215.20
  4. Step 4: Simplify right side
    54,279.20x = 1,564,755,224.64
  5. Step 5: Solve for x
    x = 1,564,755,224.64/54,279.20
  6. Step 6: Final answer
    x = 28,827.90

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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.