Home / 20,987.48-31,486.64-7,839.96

Finding the Fourth Proportional to 20,987.48, 31,486.64 and 7,839.96

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Solution

The fourth proportional to 20,987.48, 31,486.64 and 7,839.96 is: 11,761.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.48 : 31,486.64 = 7,839.96 : x
  2. Step 2: Convert to fraction form
    20,987.48/31,486.64 = 7,839.96/x
  3. Step 3: Cross multiply
    20,987.48x = 31,486.64 × 7,839.96
  4. Step 4: Simplify right side
    20,987.48x = 246,853,958.93
  5. Step 5: Solve for x
    x = 246,853,958.93/20,987.48
  6. Step 6: Final answer
    x = 11,761.97

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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.