Home / 20,870.70-28,801.50-11,310.86

Finding the Fourth Proportional to 20,870.70, 28,801.50 and 11,310.86

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Solution

The fourth proportional to 20,870.70, 28,801.50 and 11,310.86 is: 15,608.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.70 : 28,801.50 = 11,310.86 : x
  2. Step 2: Convert to fraction form
    20,870.70/28,801.50 = 11,310.86/x
  3. Step 3: Cross multiply
    20,870.70x = 28,801.50 × 11,310.86
  4. Step 4: Simplify right side
    20,870.70x = 325,769,806.29
  5. Step 5: Solve for x
    x = 325,769,806.29/20,870.70
  6. Step 6: Final answer
    x = 15,608.95

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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.