Home / 20,819.57-28,731.04-11,388.13

Finding the Fourth Proportional to 20,819.57, 28,731.04 and 11,388.13

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Solution

The fourth proportional to 20,819.57, 28,731.04 and 11,388.13 is: 15,715.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.57 : 28,731.04 = 11,388.13 : x
  2. Step 2: Convert to fraction form
    20,819.57/28,731.04 = 11,388.13/x
  3. Step 3: Cross multiply
    20,819.57x = 28,731.04 × 11,388.13
  4. Step 4: Simplify right side
    20,819.57x = 327,192,718.26
  5. Step 5: Solve for x
    x = 327,192,718.26/20,819.57
  6. Step 6: Final answer
    x = 15,715.64

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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.