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Finding the Fourth Proportional to 9,398.82, 12,940.85 and 7,979.54

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Solution

The fourth proportional to 9,398.82, 12,940.85 and 7,979.54 is: 10,986.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,398.82 : 12,940.85 = 7,979.54 : x
  2. Step 2: Convert to fraction form
    9,398.82/12,940.85 = 7,979.54/x
  3. Step 3: Cross multiply
    9,398.82x = 12,940.85 × 7,979.54
  4. Step 4: Simplify right side
    9,398.82x = 103,261,990.31
  5. Step 5: Solve for x
    x = 103,261,990.31/9,398.82
  6. Step 6: Final answer
    x = 10,986.70

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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.