Home / 20,819.34-28,730.70-11,387.88

Finding the Fourth Proportional to 20,819.34, 28,730.70 and 11,387.88

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Solution

The fourth proportional to 20,819.34, 28,730.70 and 11,387.88 is: 15,715.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.34 : 28,730.70 = 11,387.88 : x
  2. Step 2: Convert to fraction form
    20,819.34/28,730.70 = 11,387.88/x
  3. Step 3: Cross multiply
    20,819.34x = 28,730.70 × 11,387.88
  4. Step 4: Simplify right side
    20,819.34x = 327,181,763.92
  5. Step 5: Solve for x
    x = 327,181,763.92/20,819.34
  6. Step 6: Final answer
    x = 15,715.28

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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.