Home / 20,917.26-31,388.13-7,778.70

Finding the Fourth Proportional to 20,917.26, 31,388.13 and 7,778.70

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Solution

The fourth proportional to 20,917.26, 31,388.13 and 7,778.70 is: 11,672.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.26 : 31,388.13 = 7,778.70 : x
  2. Step 2: Convert to fraction form
    20,917.26/31,388.13 = 7,778.70/x
  3. Step 3: Cross multiply
    20,917.26x = 31,388.13 × 7,778.70
  4. Step 4: Simplify right side
    20,917.26x = 244,158,846.83
  5. Step 5: Solve for x
    x = 244,158,846.83/20,917.26
  6. Step 6: Final answer
    x = 11,672.60

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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.