Home / 20,981.62-28,934.14-13,425.20

Finding the Fourth Proportional to 20,981.62, 28,934.14 and 13,425.20

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Solution

The fourth proportional to 20,981.62, 28,934.14 and 13,425.20 is: 18,513.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.62 : 28,934.14 = 13,425.20 : x
  2. Step 2: Convert to fraction form
    20,981.62/28,934.14 = 13,425.20/x
  3. Step 3: Cross multiply
    20,981.62x = 28,934.14 × 13,425.20
  4. Step 4: Simplify right side
    20,981.62x = 388,446,616.33
  5. Step 5: Solve for x
    x = 388,446,616.33/20,981.62
  6. Step 6: Final answer
    x = 18,513.66

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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.