Home / 20,786.28-31,178.48-7,637.69

Finding the Fourth Proportional to 20,786.28, 31,178.48 and 7,637.69

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Solution

The fourth proportional to 20,786.28, 31,178.48 and 7,637.69 is: 11,456.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,786.28 : 31,178.48 = 7,637.69 : x
  2. Step 2: Convert to fraction form
    20,786.28/31,178.48 = 7,637.69/x
  3. Step 3: Cross multiply
    20,786.28x = 31,178.48 × 7,637.69
  4. Step 4: Simplify right side
    20,786.28x = 238,131,564.91
  5. Step 5: Solve for x
    x = 238,131,564.91/20,786.28
  6. Step 6: Final answer
    x = 11,456.19

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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.