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Finding the Fourth Proportional to 18,811.68, 28,217.52 and 7,716.24

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Solution

The fourth proportional to 18,811.68, 28,217.52 and 7,716.24 is: 11,574.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,811.68 : 28,217.52 = 7,716.24 : x
  2. Step 2: Convert to fraction form
    18,811.68/28,217.52 = 7,716.24/x
  3. Step 3: Cross multiply
    18,811.68x = 28,217.52 × 7,716.24
  4. Step 4: Simplify right side
    18,811.68x = 217,733,156.52
  5. Step 5: Solve for x
    x = 217,733,156.52/18,811.68
  6. Step 6: Final answer
    x = 11,574.36

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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.