Home / 20,388.14-28,123.68-12,822.46

Finding the Fourth Proportional to 20,388.14, 28,123.68 and 12,822.46

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Solution

The fourth proportional to 20,388.14, 28,123.68 and 12,822.46 is: 17,687.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.14 : 28,123.68 = 12,822.46 : x
  2. Step 2: Convert to fraction form
    20,388.14/28,123.68 = 12,822.46/x
  3. Step 3: Cross multiply
    20,388.14x = 28,123.68 × 12,822.46
  4. Step 4: Simplify right side
    20,388.14x = 360,614,761.85
  5. Step 5: Solve for x
    x = 360,614,761.85/20,388.14
  6. Step 6: Final answer
    x = 17,687.48

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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.