Home / 20,860.45-28,788.65-11,910.76

Finding the Fourth Proportional to 20,860.45, 28,788.65 and 11,910.76

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Solution

The fourth proportional to 20,860.45, 28,788.65 and 11,910.76 is: 16,437.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.45 : 28,788.65 = 11,910.76 : x
  2. Step 2: Convert to fraction form
    20,860.45/28,788.65 = 11,910.76/x
  3. Step 3: Cross multiply
    20,860.45x = 28,788.65 × 11,910.76
  4. Step 4: Simplify right side
    20,860.45x = 342,894,775.95
  5. Step 5: Solve for x
    x = 342,894,775.95/20,860.45
  6. Step 6: Final answer
    x = 16,437.55

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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.