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Finding the Fourth Proportional to 8,487.72, 12,728.54 and 2,939.59

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Solution

The fourth proportional to 8,487.72, 12,728.54 and 2,939.59 is: 4,408.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,487.72 : 12,728.54 = 2,939.59 : x
  2. Step 2: Convert to fraction form
    8,487.72/12,728.54 = 2,939.59/x
  3. Step 3: Cross multiply
    8,487.72x = 12,728.54 × 2,939.59
  4. Step 4: Simplify right side
    8,487.72x = 37,416,712.16
  5. Step 5: Solve for x
    x = 37,416,712.16/8,487.72
  6. Step 6: Final answer
    x = 4,408.33

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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.