Home / 20,383.70-28,130.85-11,431.78

Finding the Fourth Proportional to 20,383.70, 28,130.85 and 11,431.78

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Solution

The fourth proportional to 20,383.70, 28,130.85 and 11,431.78 is: 15,776.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,383.70 : 28,130.85 = 11,431.78 : x
  2. Step 2: Convert to fraction form
    20,383.70/28,130.85 = 11,431.78/x
  3. Step 3: Cross multiply
    20,383.70x = 28,130.85 × 11,431.78
  4. Step 4: Simplify right side
    20,383.70x = 321,585,688.41
  5. Step 5: Solve for x
    x = 321,585,688.41/20,383.70
  6. Step 6: Final answer
    x = 15,776.61

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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.