Home / 20,938.76-28,895.10-11,507.12

Finding the Fourth Proportional to 20,938.76, 28,895.10 and 11,507.12

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Solution

The fourth proportional to 20,938.76, 28,895.10 and 11,507.12 is: 15,879.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,938.76 : 28,895.10 = 11,507.12 : x
  2. Step 2: Convert to fraction form
    20,938.76/28,895.10 = 11,507.12/x
  3. Step 3: Cross multiply
    20,938.76x = 28,895.10 × 11,507.12
  4. Step 4: Simplify right side
    20,938.76x = 332,499,383.11
  5. Step 5: Solve for x
    x = 332,499,383.11/20,938.76
  6. Step 6: Final answer
    x = 15,879.61

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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.