Home / 20,761.12-31,141.68-5,178.70

Finding the Fourth Proportional to 20,761.12, 31,141.68 and 5,178.70

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Solution

The fourth proportional to 20,761.12, 31,141.68 and 5,178.70 is: 7,768.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.12 : 31,141.68 = 5,178.70 : x
  2. Step 2: Convert to fraction form
    20,761.12/31,141.68 = 5,178.70/x
  3. Step 3: Cross multiply
    20,761.12x = 31,141.68 × 5,178.70
  4. Step 4: Simplify right side
    20,761.12x = 161,273,418.22
  5. Step 5: Solve for x
    x = 161,273,418.22/20,761.12
  6. Step 6: Final answer
    x = 7,768.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.