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Finding the Fourth Proportional to 8,979.86, 12,391.36 and 5,203.17

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Solution

The fourth proportional to 8,979.86, 12,391.36 and 5,203.17 is: 7,179.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.86 : 12,391.36 = 5,203.17 : x
  2. Step 2: Convert to fraction form
    8,979.86/12,391.36 = 5,203.17/x
  3. Step 3: Cross multiply
    8,979.86x = 12,391.36 × 5,203.17
  4. Step 4: Simplify right side
    8,979.86x = 64,474,290.65
  5. Step 5: Solve for x
    x = 64,474,290.65/8,979.86
  6. Step 6: Final answer
    x = 7,179.88

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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.