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Finding the Fourth Proportional to 8,655.85, 12,978.24 and 5,144.92

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Solution

The fourth proportional to 8,655.85, 12,978.24 and 5,144.92 is: 7,714.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,655.85 : 12,978.24 = 5,144.92 : x
  2. Step 2: Convert to fraction form
    8,655.85/12,978.24 = 5,144.92/x
  3. Step 3: Cross multiply
    8,655.85x = 12,978.24 × 5,144.92
  4. Step 4: Simplify right side
    8,655.85x = 66,772,006.54
  5. Step 5: Solve for x
    x = 66,772,006.54/8,655.85
  6. Step 6: Final answer
    x = 7,714.09

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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.