Home / 21,150-31,721.55-7,999.24

Finding the Fourth Proportional to 21,150, 31,721.55 and 7,999.24

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Solution

The fourth proportional to 21,150, 31,721.55 and 7,999.24 is: 11,997.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,150 : 31,721.55 = 7,999.24 : x
  2. Step 2: Convert to fraction form
    21,150/31,721.55 = 7,999.24/x
  3. Step 3: Cross multiply
    21,150x = 31,721.55 × 7,999.24
  4. Step 4: Simplify right side
    21,150x = 253,748,291.62
  5. Step 5: Solve for x
    x = 253,748,291.62/21,150
  6. Step 6: Final answer
    x = 11,997.56

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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.