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Finding the Fourth Proportional to 8,679.06, 11,978.30 and 5,321.28

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Solution

The fourth proportional to 8,679.06, 11,978.30 and 5,321.28 is: 7,344.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.06 : 11,978.30 = 5,321.28 : x
  2. Step 2: Convert to fraction form
    8,679.06/11,978.30 = 5,321.28/x
  3. Step 3: Cross multiply
    8,679.06x = 11,978.30 × 5,321.28
  4. Step 4: Simplify right side
    8,679.06x = 63,739,861.62
  5. Step 5: Solve for x
    x = 63,739,861.62/8,679.06
  6. Step 6: Final answer
    x = 7,344.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.