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Finding the Fourth Proportional to 8,613.68, 12,921.66 and 4,231.28

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Solution

The fourth proportional to 8,613.68, 12,921.66 and 4,231.28 is: 6,347.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,613.68 : 12,921.66 = 4,231.28 : x
  2. Step 2: Convert to fraction form
    8,613.68/12,921.66 = 4,231.28/x
  3. Step 3: Cross multiply
    8,613.68x = 12,921.66 × 4,231.28
  4. Step 4: Simplify right side
    8,613.68x = 54,675,161.52
  5. Step 5: Solve for x
    x = 54,675,161.52/8,613.68
  6. Step 6: Final answer
    x = 6,347.48

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1.5x scale

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.