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Finding the Fourth Proportional to 7,166.12, 9,889.05 and 3,979.38

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Solution

The fourth proportional to 7,166.12, 9,889.05 and 3,979.38 is: 5,491.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,166.12 : 9,889.05 = 3,979.38 : x
  2. Step 2: Convert to fraction form
    7,166.12/9,889.05 = 3,979.38/x
  3. Step 3: Cross multiply
    7,166.12x = 9,889.05 × 3,979.38
  4. Step 4: Simplify right side
    7,166.12x = 39,352,287.79
  5. Step 5: Solve for x
    x = 39,352,287.79/7,166.12
  6. Step 6: Final answer
    x = 5,491.44

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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.