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Finding the Fourth Proportional to 54,479.40, 81,702.90 and 21,180.30

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Solution

The fourth proportional to 54,479.40, 81,702.90 and 21,180.30 is: 31,764.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,479.40 : 81,702.90 = 21,180.30 : x
  2. Step 2: Convert to fraction form
    54,479.40/81,702.90 = 21,180.30/x
  3. Step 3: Cross multiply
    54,479.40x = 81,702.90 × 21,180.30
  4. Step 4: Simplify right side
    54,479.40x = 1,730,491,932.87
  5. Step 5: Solve for x
    x = 1,730,491,932.87/54,479.40
  6. Step 6: Final answer
    x = 31,764.15

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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.