Home / 20,891.34-31,338.81-7,743.81

Finding the Fourth Proportional to 20,891.34, 31,338.81 and 7,743.81

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Solution

The fourth proportional to 20,891.34, 31,338.81 and 7,743.81 is: 11,616.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.34 : 31,338.81 = 7,743.81 : x
  2. Step 2: Convert to fraction form
    20,891.34/31,338.81 = 7,743.81/x
  3. Step 3: Cross multiply
    20,891.34x = 31,338.81 × 7,743.81
  4. Step 4: Simplify right side
    20,891.34x = 242,681,790.27
  5. Step 5: Solve for x
    x = 242,681,790.27/20,891.34
  6. Step 6: Final answer
    x = 11,616.38

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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.