Home / 20,819.86-28,730.97-11,388.10

Finding the Fourth Proportional to 20,819.86, 28,730.97 and 11,388.10

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Solution

The fourth proportional to 20,819.86, 28,730.97 and 11,388.10 is: 15,715.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.86 : 28,730.97 = 11,388.10 : x
  2. Step 2: Convert to fraction form
    20,819.86/28,730.97 = 11,388.10/x
  3. Step 3: Cross multiply
    20,819.86x = 28,730.97 × 11,388.10
  4. Step 4: Simplify right side
    20,819.86x = 327,191,159.46
  5. Step 5: Solve for x
    x = 327,191,159.46/20,819.86
  6. Step 6: Final answer
    x = 15,715.34

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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.