Home / 20,821.79-31,182.64-11,910.11

Finding the Fourth Proportional to 20,821.79, 31,182.64 and 11,910.11

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Solution

The fourth proportional to 20,821.79, 31,182.64 and 11,910.11 is: 17,836.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.79 : 31,182.64 = 11,910.11 : x
  2. Step 2: Convert to fraction form
    20,821.79/31,182.64 = 11,910.11/x
  3. Step 3: Cross multiply
    20,821.79x = 31,182.64 × 11,910.11
  4. Step 4: Simplify right side
    20,821.79x = 371,388,486.80
  5. Step 5: Solve for x
    x = 371,388,486.80/20,821.79
  6. Step 6: Final answer
    x = 17,836.53

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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.