Home / 20,930.52-31,390.92-7,789.08

Finding the Fourth Proportional to 20,930.52, 31,390.92 and 7,789.08

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Solution

The fourth proportional to 20,930.52, 31,390.92 and 7,789.08 is: 11,681.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.52 : 31,390.92 = 7,789.08 : x
  2. Step 2: Convert to fraction form
    20,930.52/31,390.92 = 7,789.08/x
  3. Step 3: Cross multiply
    20,930.52x = 31,390.92 × 7,789.08
  4. Step 4: Simplify right side
    20,930.52x = 244,506,387.15
  5. Step 5: Solve for x
    x = 244,506,387.15/20,930.52
  6. Step 6: Final answer
    x = 11,681.81

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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.