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Finding the Fourth Proportional to 54,446.40, 81,630.99 and 21,138.39

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Solution

The fourth proportional to 54,446.40, 81,630.99 and 21,138.39 is: 31,692.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,446.40 : 81,630.99 = 21,138.39 : x
  2. Step 2: Convert to fraction form
    54,446.40/81,630.99 = 21,138.39/x
  3. Step 3: Cross multiply
    54,446.40x = 81,630.99 × 21,138.39
  4. Step 4: Simplify right side
    54,446.40x = 1,725,547,702.71
  5. Step 5: Solve for x
    x = 1,725,547,702.71/54,446.40
  6. Step 6: Final answer
    x = 31,692.59

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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.