Home / 20,354.09-28,105.38-12,812.58

Finding the Fourth Proportional to 20,354.09, 28,105.38 and 12,812.58

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Solution

The fourth proportional to 20,354.09, 28,105.38 and 12,812.58 is: 17,691.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,354.09 : 28,105.38 = 12,812.58 : x
  2. Step 2: Convert to fraction form
    20,354.09/28,105.38 = 12,812.58/x
  3. Step 3: Cross multiply
    20,354.09x = 28,105.38 × 12,812.58
  4. Step 4: Simplify right side
    20,354.09x = 360,102,429.68
  5. Step 5: Solve for x
    x = 360,102,429.68/20,354.09
  6. Step 6: Final answer
    x = 17,691.90

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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.