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Finding the Fourth Proportional to 8,517.80, 11,752.80 and 5,159.96

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Solution

The fourth proportional to 8,517.80, 11,752.80 and 5,159.96 is: 7,119.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,517.80 : 11,752.80 = 5,159.96 : x
  2. Step 2: Convert to fraction form
    8,517.80/11,752.80 = 5,159.96/x
  3. Step 3: Cross multiply
    8,517.80x = 11,752.80 × 5,159.96
  4. Step 4: Simplify right side
    8,517.80x = 60,643,977.89
  5. Step 5: Solve for x
    x = 60,643,977.89/8,517.80
  6. Step 6: Final answer
    x = 7,119.68

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1.5x scale

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.