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Finding the Fourth Proportional to 21,988.71, 32,979.87 and 7,198.21

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Solution

The fourth proportional to 21,988.71, 32,979.87 and 7,198.21 is: 10,796.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.71 : 32,979.87 = 7,198.21 : x
  2. Step 2: Convert to fraction form
    21,988.71/32,979.87 = 7,198.21/x
  3. Step 3: Cross multiply
    21,988.71x = 32,979.87 × 7,198.21
  4. Step 4: Simplify right side
    21,988.71x = 237,396,030.03
  5. Step 5: Solve for x
    x = 237,396,030.03/21,988.71
  6. Step 6: Final answer
    x = 10,796.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.