Home / 20,286.86-28,006.36-13,988.30

Finding the Fourth Proportional to 20,286.86, 28,006.36 and 13,988.30

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Solution

The fourth proportional to 20,286.86, 28,006.36 and 13,988.30 is: 19,311.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,286.86 : 28,006.36 = 13,988.30 : x
  2. Step 2: Convert to fraction form
    20,286.86/28,006.36 = 13,988.30/x
  3. Step 3: Cross multiply
    20,286.86x = 28,006.36 × 13,988.30
  4. Step 4: Simplify right side
    20,286.86x = 391,761,190.59
  5. Step 5: Solve for x
    x = 391,761,190.59/20,286.86
  6. Step 6: Final answer
    x = 19,311.09

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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.