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Finding the Fourth Proportional to 115,787.20, 173,680.80 and 40,991.80

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Solution

The fourth proportional to 115,787.20, 173,680.80 and 40,991.80 is: 61,487.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,787.20 : 173,680.80 = 40,991.80 : x
  2. Step 2: Convert to fraction form
    115,787.20/173,680.80 = 40,991.80/x
  3. Step 3: Cross multiply
    115,787.20x = 173,680.80 × 40,991.80
  4. Step 4: Simplify right side
    115,787.20x = 7,119,488,617.44
  5. Step 5: Solve for x
    x = 7,119,488,617.44/115,787.20
  6. Step 6: Final answer
    x = 61,487.70

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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.