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Finding the Fourth Proportional to 15,811.20, 23,716.80 and 13,219.20

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Solution

The fourth proportional to 15,811.20, 23,716.80 and 13,219.20 is: 19,828.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,811.20 : 23,716.80 = 13,219.20 : x
  2. Step 2: Convert to fraction form
    15,811.20/23,716.80 = 13,219.20/x
  3. Step 3: Cross multiply
    15,811.20x = 23,716.80 × 13,219.20
  4. Step 4: Simplify right side
    15,811.20x = 313,517,122.56
  5. Step 5: Solve for x
    x = 313,517,122.56/15,811.20
  6. Step 6: Final answer
    x = 19,828.80

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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.