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Finding the Fourth Proportional to 53,909.20, 80,863.80 and 40,787.20

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Solution

The fourth proportional to 53,909.20, 80,863.80 and 40,787.20 is: 61,180.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,909.20 : 80,863.80 = 40,787.20 : x
  2. Step 2: Convert to fraction form
    53,909.20/80,863.80 = 40,787.20/x
  3. Step 3: Cross multiply
    53,909.20x = 80,863.80 × 40,787.20
  4. Step 4: Simplify right side
    53,909.20x = 3,298,207,983.36
  5. Step 5: Solve for x
    x = 3,298,207,983.36/53,909.20
  6. Step 6: Final answer
    x = 61,180.80

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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.