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Finding the Fourth Proportional to 170,759.20, 256,138.80 and 87,815.20

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Solution

The fourth proportional to 170,759.20, 256,138.80 and 87,815.20 is: 131,722.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,759.20 : 256,138.80 = 87,815.20 : x
  2. Step 2: Convert to fraction form
    170,759.20/256,138.80 = 87,815.20/x
  3. Step 3: Cross multiply
    170,759.20x = 256,138.80 × 87,815.20
  4. Step 4: Simplify right side
    170,759.20x = 22,492,879,949.76
  5. Step 5: Solve for x
    x = 22,492,879,949.76/170,759.20
  6. Step 6: Final answer
    x = 131,722.80

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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.