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Finding the Fourth Proportional to 28,568.81, 42,860.03 and 11,919.59

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Solution

The fourth proportional to 28,568.81, 42,860.03 and 11,919.59 is: 17,882.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,568.81 : 42,860.03 = 11,919.59 : x
  2. Step 2: Convert to fraction form
    28,568.81/42,860.03 = 11,919.59/x
  3. Step 3: Cross multiply
    28,568.81x = 42,860.03 × 11,919.59
  4. Step 4: Simplify right side
    28,568.81x = 510,873,711.09
  5. Step 5: Solve for x
    x = 510,873,711.09/28,568.81
  6. Step 6: Final answer
    x = 17,882.22

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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.