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Finding the Fourth Proportional to 17,811.20, 26,716.80 and 15,915.80

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Solution

The fourth proportional to 17,811.20, 26,716.80 and 15,915.80 is: 23,873.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,811.20 : 26,716.80 = 15,915.80 : x
  2. Step 2: Convert to fraction form
    17,811.20/26,716.80 = 15,915.80/x
  3. Step 3: Cross multiply
    17,811.20x = 26,716.80 × 15,915.80
  4. Step 4: Simplify right side
    17,811.20x = 425,219,245.44
  5. Step 5: Solve for x
    x = 425,219,245.44/17,811.20
  6. Step 6: Final answer
    x = 23,873.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.