Home / 20,378.64-28,121.88-11,426.66

Finding the Fourth Proportional to 20,378.64, 28,121.88 and 11,426.66

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Solution

The fourth proportional to 20,378.64, 28,121.88 and 11,426.66 is: 15,768.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.64 : 28,121.88 = 11,426.66 : x
  2. Step 2: Convert to fraction form
    20,378.64/28,121.88 = 11,426.66/x
  3. Step 3: Cross multiply
    20,378.64x = 28,121.88 × 11,426.66
  4. Step 4: Simplify right side
    20,378.64x = 321,339,161.32
  5. Step 5: Solve for x
    x = 321,339,161.32/20,378.64
  6. Step 6: Final answer
    x = 15,768.43

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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.