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Finding the Fourth Proportional to 20,391.84, 28,140.84 and 11,438.82

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Solution

The fourth proportional to 20,391.84, 28,140.84 and 11,438.82 is: 15,785.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.84 : 28,140.84 = 11,438.82 : x
  2. Step 2: Convert to fraction form
    20,391.84/28,140.84 = 11,438.82/x
  3. Step 3: Cross multiply
    20,391.84x = 28,140.84 × 11,438.82
  4. Step 4: Simplify right side
    20,391.84x = 321,898,003.41
  5. Step 5: Solve for x
    x = 321,898,003.41/20,391.84
  6. Step 6: Final answer
    x = 15,785.63

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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.