Home / 20,909.07-28,891.91-15,553.11

Finding the Fourth Proportional to 20,909.07, 28,891.91 and 15,553.11

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Solution

The fourth proportional to 20,909.07, 28,891.91 and 15,553.11 is: 21,491.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.07 : 28,891.91 = 15,553.11 : x
  2. Step 2: Convert to fraction form
    20,909.07/28,891.91 = 15,553.11/x
  3. Step 3: Cross multiply
    20,909.07x = 28,891.91 × 15,553.11
  4. Step 4: Simplify right side
    20,909.07x = 449,358,976.57
  5. Step 5: Solve for x
    x = 449,358,976.57/20,909.07
  6. Step 6: Final answer
    x = 21,491.10

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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.