Home / 20,989.22-28,991.13-15,237.50

Finding the Fourth Proportional to 20,989.22, 28,991.13 and 15,237.50

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Solution

The fourth proportional to 20,989.22, 28,991.13 and 15,237.50 is: 21,046.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.22 : 28,991.13 = 15,237.50 : x
  2. Step 2: Convert to fraction form
    20,989.22/28,991.13 = 15,237.50/x
  3. Step 3: Cross multiply
    20,989.22x = 28,991.13 × 15,237.50
  4. Step 4: Simplify right side
    20,989.22x = 441,752,198.42
  5. Step 5: Solve for x
    x = 441,752,198.42/20,989.22
  6. Step 6: Final answer
    x = 21,046.63

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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.