Home / 18,916.80-28,387.20-7,231.36

Finding the Fourth Proportional to 18,916.80, 28,387.20 and 7,231.36

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Solution

The fourth proportional to 18,916.80, 28,387.20 and 7,231.36 is: 10,851.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,916.80 : 28,387.20 = 7,231.36 : x
  2. Step 2: Convert to fraction form
    18,916.80/28,387.20 = 7,231.36/x
  3. Step 3: Cross multiply
    18,916.80x = 28,387.20 × 7,231.36
  4. Step 4: Simplify right side
    18,916.80x = 205,278,062.59
  5. Step 5: Solve for x
    x = 205,278,062.59/18,916.80
  6. Step 6: Final answer
    x = 10,851.63

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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.