Home / 20,558.91-28,371.20-11,127.45

Finding the Fourth Proportional to 20,558.91, 28,371.20 and 11,127.45

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Solution

The fourth proportional to 20,558.91, 28,371.20 and 11,127.45 is: 15,355.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,558.91 : 28,371.20 = 11,127.45 : x
  2. Step 2: Convert to fraction form
    20,558.91/28,371.20 = 11,127.45/x
  3. Step 3: Cross multiply
    20,558.91x = 28,371.20 × 11,127.45
  4. Step 4: Simplify right side
    20,558.91x = 315,699,053.80
  5. Step 5: Solve for x
    x = 315,699,053.80/20,558.91
  6. Step 6: Final answer
    x = 15,355.83

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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.