Home / 20,638.22-28,480.86-11,206.78

Finding the Fourth Proportional to 20,638.22, 28,480.86 and 11,206.78

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Solution

The fourth proportional to 20,638.22, 28,480.86 and 11,206.78 is: 15,465.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.22 : 28,480.86 = 11,206.78 : x
  2. Step 2: Convert to fraction form
    20,638.22/28,480.86 = 11,206.78/x
  3. Step 3: Cross multiply
    20,638.22x = 28,480.86 × 11,206.78
  4. Step 4: Simplify right side
    20,638.22x = 319,178,732.23
  5. Step 5: Solve for x
    x = 319,178,732.23/20,638.22
  6. Step 6: Final answer
    x = 15,465.42

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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.