Home / 20,951.13-28,912.60-11,519.70

Finding the Fourth Proportional to 20,951.13, 28,912.60 and 11,519.70

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Solution

The fourth proportional to 20,951.13, 28,912.60 and 11,519.70 is: 15,897.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.13 : 28,912.60 = 11,519.70 : x
  2. Step 2: Convert to fraction form
    20,951.13/28,912.60 = 11,519.70/x
  3. Step 3: Cross multiply
    20,951.13x = 28,912.60 × 11,519.70
  4. Step 4: Simplify right side
    20,951.13x = 333,064,478.22
  5. Step 5: Solve for x
    x = 333,064,478.22/20,951.13
  6. Step 6: Final answer
    x = 15,897.21

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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.