Home / 20,918.90-31,382.24-6,879.71

Finding the Fourth Proportional to 20,918.90, 31,382.24 and 6,879.71

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Solution

The fourth proportional to 20,918.90, 31,382.24 and 6,879.71 is: 10,320.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.90 : 31,382.24 = 6,879.71 : x
  2. Step 2: Convert to fraction form
    20,918.90/31,382.24 = 6,879.71/x
  3. Step 3: Cross multiply
    20,918.90x = 31,382.24 × 6,879.71
  4. Step 4: Simplify right side
    20,918.90x = 215,900,710.35
  5. Step 5: Solve for x
    x = 215,900,710.35/20,918.90
  6. Step 6: Final answer
    x = 10,320.84

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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.