Home / 20,570.94-28,388.10-11,139.70

Finding the Fourth Proportional to 20,570.94, 28,388.10 and 11,139.70

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Solution

The fourth proportional to 20,570.94, 28,388.10 and 11,139.70 is: 15,372.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.94 : 28,388.10 = 11,139.70 : x
  2. Step 2: Convert to fraction form
    20,570.94/28,388.10 = 11,139.70/x
  3. Step 3: Cross multiply
    20,570.94x = 28,388.10 × 11,139.70
  4. Step 4: Simplify right side
    20,570.94x = 316,234,917.57
  5. Step 5: Solve for x
    x = 316,234,917.57/20,570.94
  6. Step 6: Final answer
    x = 15,372.90

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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.