Home / 20,821.86-28,733.13-11,390.22

Finding the Fourth Proportional to 20,821.86, 28,733.13 and 11,390.22

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Solution

The fourth proportional to 20,821.86, 28,733.13 and 11,390.22 is: 15,717.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.86 : 28,733.13 = 11,390.22 : x
  2. Step 2: Convert to fraction form
    20,821.86/28,733.13 = 11,390.22/x
  3. Step 3: Cross multiply
    20,821.86x = 28,733.13 × 11,390.22
  4. Step 4: Simplify right side
    20,821.86x = 327,276,671.99
  5. Step 5: Solve for x
    x = 327,276,671.99/20,821.86
  6. Step 6: Final answer
    x = 15,717.94

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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.