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Finding the Fourth Proportional to 8,669.60, 12,978.87 and 5,372.09

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Solution

The fourth proportional to 8,669.60, 12,978.87 and 5,372.09 is: 8,042.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,669.60 : 12,978.87 = 5,372.09 : x
  2. Step 2: Convert to fraction form
    8,669.60/12,978.87 = 5,372.09/x
  3. Step 3: Cross multiply
    8,669.60x = 12,978.87 × 5,372.09
  4. Step 4: Simplify right side
    8,669.60x = 69,723,657.74
  5. Step 5: Solve for x
    x = 69,723,657.74/8,669.60
  6. Step 6: Final answer
    x = 8,042.32

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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.