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Finding the Fourth Proportional to 20,995.97, 28,976.49 and 15,681.56

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Solution

The fourth proportional to 20,995.97, 28,976.49 and 15,681.56 is: 21,642.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995.97 : 28,976.49 = 15,681.56 : x
  2. Step 2: Convert to fraction form
    20,995.97/28,976.49 = 15,681.56/x
  3. Step 3: Cross multiply
    20,995.97x = 28,976.49 × 15,681.56
  4. Step 4: Simplify right side
    20,995.97x = 454,396,566.52
  5. Step 5: Solve for x
    x = 454,396,566.52/20,995.97
  6. Step 6: Final answer
    x = 21,642.08

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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.