Home / 20,998.13-31,497.80-5,415.75

Finding the Fourth Proportional to 20,998.13, 31,497.80 and 5,415.75

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Solution

The fourth proportional to 20,998.13, 31,497.80 and 5,415.75 is: 8,123.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,998.13 : 31,497.80 = 5,415.75 : x
  2. Step 2: Convert to fraction form
    20,998.13/31,497.80 = 5,415.75/x
  3. Step 3: Cross multiply
    20,998.13x = 31,497.80 × 5,415.75
  4. Step 4: Simplify right side
    20,998.13x = 170,584,183.27
  5. Step 5: Solve for x
    x = 170,584,183.27/20,998.13
  6. Step 6: Final answer
    x = 8,123.78

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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.