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Finding the Fourth Proportional to 8,979.62, 12,391.84 and 5,000.78

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Solution

The fourth proportional to 8,979.62, 12,391.84 and 5,000.78 is: 6,901.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.62 : 12,391.84 = 5,000.78 : x
  2. Step 2: Convert to fraction form
    8,979.62/12,391.84 = 5,000.78/x
  3. Step 3: Cross multiply
    8,979.62x = 12,391.84 × 5,000.78
  4. Step 4: Simplify right side
    8,979.62x = 61,968,791.17
  5. Step 5: Solve for x
    x = 61,968,791.17/8,979.62
  6. Step 6: Final answer
    x = 6,901.05

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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.