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Finding the Fourth Proportional to 20,575.26, 28,393.80 and 11,143.80

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Solution

The fourth proportional to 20,575.26, 28,393.80 and 11,143.80 is: 15,378.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,575.26 : 28,393.80 = 11,143.80 : x
  2. Step 2: Convert to fraction form
    20,575.26/28,393.80 = 11,143.80/x
  3. Step 3: Cross multiply
    20,575.26x = 28,393.80 × 11,143.80
  4. Step 4: Simplify right side
    20,575.26x = 316,414,828.44
  5. Step 5: Solve for x
    x = 316,414,828.44/20,575.26
  6. Step 6: Final answer
    x = 15,378.41

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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.