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Finding the Fourth Proportional to 8,978.20, 12,388.10 and 5,439.36

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Solution

The fourth proportional to 8,978.20, 12,388.10 and 5,439.36 is: 7,505.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.20 : 12,388.10 = 5,439.36 : x
  2. Step 2: Convert to fraction form
    8,978.20/12,388.10 = 5,439.36/x
  3. Step 3: Cross multiply
    8,978.20x = 12,388.10 × 5,439.36
  4. Step 4: Simplify right side
    8,978.20x = 67,383,335.62
  5. Step 5: Solve for x
    x = 67,383,335.62/8,978.20
  6. Step 6: Final answer
    x = 7,505.22

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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.