Home / 20,821.27-28,732.75-11,389.63

Finding the Fourth Proportional to 20,821.27, 28,732.75 and 11,389.63

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Solution

The fourth proportional to 20,821.27, 28,732.75 and 11,389.63 is: 15,717.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.27 : 28,732.75 = 11,389.63 : x
  2. Step 2: Convert to fraction form
    20,821.27/28,732.75 = 11,389.63/x
  3. Step 3: Cross multiply
    20,821.27x = 28,732.75 × 11,389.63
  4. Step 4: Simplify right side
    20,821.27x = 327,255,391.38
  5. Step 5: Solve for x
    x = 327,255,391.38/20,821.27
  6. Step 6: Final answer
    x = 15,717.36

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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.