Home / 20,911.28-28,857.47-11,351.21

Finding the Fourth Proportional to 20,911.28, 28,857.47 and 11,351.21

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Solution

The fourth proportional to 20,911.28, 28,857.47 and 11,351.21 is: 15,664.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.28 : 28,857.47 = 11,351.21 : x
  2. Step 2: Convert to fraction form
    20,911.28/28,857.47 = 11,351.21/x
  3. Step 3: Cross multiply
    20,911.28x = 28,857.47 × 11,351.21
  4. Step 4: Simplify right side
    20,911.28x = 327,567,001.00
  5. Step 5: Solve for x
    x = 327,567,001.00/20,911.28
  6. Step 6: Final answer
    x = 15,664.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.