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Finding the Fourth Proportional to 8,515.68, 12,751.65 and 5,218.79

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Solution

The fourth proportional to 8,515.68, 12,751.65 and 5,218.79 is: 7,814.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,515.68 : 12,751.65 = 5,218.79 : x
  2. Step 2: Convert to fraction form
    8,515.68/12,751.65 = 5,218.79/x
  3. Step 3: Cross multiply
    8,515.68x = 12,751.65 × 5,218.79
  4. Step 4: Simplify right side
    8,515.68x = 66,548,119.75
  5. Step 5: Solve for x
    x = 66,548,119.75/8,515.68
  6. Step 6: Final answer
    x = 7,814.77

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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.