Home / 20,860.92-28,788.42-11,428.86

Finding the Fourth Proportional to 20,860.92, 28,788.42 and 11,428.86

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Solution

The fourth proportional to 20,860.92, 28,788.42 and 11,428.86 is: 15,772.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.92 : 28,788.42 = 11,428.86 : x
  2. Step 2: Convert to fraction form
    20,860.92/28,788.42 = 11,428.86/x
  3. Step 3: Cross multiply
    20,860.92x = 28,788.42 × 11,428.86
  4. Step 4: Simplify right side
    20,860.92x = 329,018,821.80
  5. Step 5: Solve for x
    x = 329,018,821.80/20,860.92
  6. Step 6: Final answer
    x = 15,772.02

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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.