Home / 21,321.30-31,991.16-11,449.02

Finding the Fourth Proportional to 21,321.30, 31,991.16 and 11,449.02

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Solution

The fourth proportional to 21,321.30, 31,991.16 and 11,449.02 is: 17,178.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.30 : 31,991.16 = 11,449.02 : x
  2. Step 2: Convert to fraction form
    21,321.30/31,991.16 = 11,449.02/x
  3. Step 3: Cross multiply
    21,321.30x = 31,991.16 × 11,449.02
  4. Step 4: Simplify right side
    21,321.30x = 366,267,430.66
  5. Step 5: Solve for x
    x = 366,267,430.66/21,321.30
  6. Step 6: Final answer
    x = 17,178.48

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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.