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Finding the Fourth Proportional to 31,638, 43,661.20 and 20,479.44

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Solution

The fourth proportional to 31,638, 43,661.20 and 20,479.44 is: 28,262.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,638 : 43,661.20 = 20,479.44 : x
  2. Step 2: Convert to fraction form
    31,638/43,661.20 = 20,479.44/x
  3. Step 3: Cross multiply
    31,638x = 43,661.20 × 20,479.44
  4. Step 4: Simplify right side
    31,638x = 894,156,925.73
  5. Step 5: Solve for x
    x = 894,156,925.73/31,638
  6. Step 6: Final answer
    x = 28,262.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.