Home / 20,821.80-31,221.90-7,667.40

Finding the Fourth Proportional to 20,821.80, 31,221.90 and 7,667.40

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Solution

The fourth proportional to 20,821.80, 31,221.90 and 7,667.40 is: 11,497.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.80 : 31,221.90 = 7,667.40 : x
  2. Step 2: Convert to fraction form
    20,821.80/31,221.90 = 7,667.40/x
  3. Step 3: Cross multiply
    20,821.80x = 31,221.90 × 7,667.40
  4. Step 4: Simplify right side
    20,821.80x = 239,390,796.06
  5. Step 5: Solve for x
    x = 239,390,796.06/20,821.80
  6. Step 6: Final answer
    x = 11,497.12

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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.