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Finding the Fourth Proportional to 8,478.72, 12,725.84 and 4,321.71

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Solution

The fourth proportional to 8,478.72, 12,725.84 and 4,321.71 is: 6,486.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,478.72 : 12,725.84 = 4,321.71 : x
  2. Step 2: Convert to fraction form
    8,478.72/12,725.84 = 4,321.71/x
  3. Step 3: Cross multiply
    8,478.72x = 12,725.84 × 4,321.71
  4. Step 4: Simplify right side
    8,478.72x = 54,997,400.79
  5. Step 5: Solve for x
    x = 54,997,400.79/8,478.72
  6. Step 6: Final answer
    x = 6,486.52

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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.