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Finding the Fourth Proportional to 8,979.78, 12,391.02 and 5,000.28

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Solution

The fourth proportional to 8,979.78, 12,391.02 and 5,000.28 is: 6,899.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.78 : 12,391.02 = 5,000.28 : x
  2. Step 2: Convert to fraction form
    8,979.78/12,391.02 = 5,000.28/x
  3. Step 3: Cross multiply
    8,979.78x = 12,391.02 × 5,000.28
  4. Step 4: Simplify right side
    8,979.78x = 61,958,569.49
  5. Step 5: Solve for x
    x = 61,958,569.49/8,979.78
  6. Step 6: Final answer
    x = 6,899.79

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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.