Home / 20,868.38-28,800.18-11,438.76

Finding the Fourth Proportional to 20,868.38, 28,800.18 and 11,438.76

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Solution

The fourth proportional to 20,868.38, 28,800.18 and 11,438.76 is: 15,786.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.38 : 28,800.18 = 11,438.76 : x
  2. Step 2: Convert to fraction form
    20,868.38/28,800.18 = 11,438.76/x
  3. Step 3: Cross multiply
    20,868.38x = 28,800.18 × 11,438.76
  4. Step 4: Simplify right side
    20,868.38x = 329,438,346.98
  5. Step 5: Solve for x
    x = 329,438,346.98/20,868.38
  6. Step 6: Final answer
    x = 15,786.49

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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.