Home / 20,631.38-28,477.78-13,179.38

Finding the Fourth Proportional to 20,631.38, 28,477.78 and 13,179.38

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Solution

The fourth proportional to 20,631.38, 28,477.78 and 13,179.38 is: 18,191.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,631.38 : 28,477.78 = 13,179.38 : x
  2. Step 2: Convert to fraction form
    20,631.38/28,477.78 = 13,179.38/x
  3. Step 3: Cross multiply
    20,631.38x = 28,477.78 × 13,179.38
  4. Step 4: Simplify right side
    20,631.38x = 375,319,308.84
  5. Step 5: Solve for x
    x = 375,319,308.84/20,631.38
  6. Step 6: Final answer
    x = 18,191.68

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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.