Home / 20,872.23-31,313.07-11,991.66

Finding the Fourth Proportional to 20,872.23, 31,313.07 and 11,991.66

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Solution

The fourth proportional to 20,872.23, 31,313.07 and 11,991.66 is: 17,990.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.23 : 31,313.07 = 11,991.66 : x
  2. Step 2: Convert to fraction form
    20,872.23/31,313.07 = 11,991.66/x
  3. Step 3: Cross multiply
    20,872.23x = 31,313.07 × 11,991.66
  4. Step 4: Simplify right side
    20,872.23x = 375,495,689.00
  5. Step 5: Solve for x
    x = 375,495,689.00/20,872.23
  6. Step 6: Final answer
    x = 17,990.20

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1.5x scale

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.