Home / 20,819.84-28,731.84-11,388.40

Finding the Fourth Proportional to 20,819.84, 28,731.84 and 11,388.40

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Solution

The fourth proportional to 20,819.84, 28,731.84 and 11,388.40 is: 15,716.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.84 : 28,731.84 = 11,388.40 : x
  2. Step 2: Convert to fraction form
    20,819.84/28,731.84 = 11,388.40/x
  3. Step 3: Cross multiply
    20,819.84x = 28,731.84 × 11,388.40
  4. Step 4: Simplify right side
    20,819.84x = 327,209,686.66
  5. Step 5: Solve for x
    x = 327,209,686.66/20,819.84
  6. Step 6: Final answer
    x = 15,716.24

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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.