Home / 20,821.09-28,733.16-11,389.63

Finding the Fourth Proportional to 20,821.09, 28,733.16 and 11,389.63

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Solution

The fourth proportional to 20,821.09, 28,733.16 and 11,389.63 is: 15,717.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.09 : 28,733.16 = 11,389.63 : x
  2. Step 2: Convert to fraction form
    20,821.09/28,733.16 = 11,389.63/x
  3. Step 3: Cross multiply
    20,821.09x = 28,733.16 × 11,389.63
  4. Step 4: Simplify right side
    20,821.09x = 327,260,061.13
  5. Step 5: Solve for x
    x = 327,260,061.13/20,821.09
  6. Step 6: Final answer
    x = 15,717.72

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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.