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Finding the Fourth Proportional to 8,979.61, 12,392.15 and 5,395.21

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Solution

The fourth proportional to 8,979.61, 12,392.15 and 5,395.21 is: 7,445.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.61 : 12,392.15 = 5,395.21 : x
  2. Step 2: Convert to fraction form
    8,979.61/12,392.15 = 5,395.21/x
  3. Step 3: Cross multiply
    8,979.61x = 12,392.15 × 5,395.21
  4. Step 4: Simplify right side
    8,979.61x = 66,858,251.60
  5. Step 5: Solve for x
    x = 66,858,251.60/8,979.61
  6. Step 6: Final answer
    x = 7,445.56

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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.