Home / 20,858.91-31,288.34-8,378.93

Finding the Fourth Proportional to 20,858.91, 31,288.34 and 8,378.93

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Solution

The fourth proportional to 20,858.91, 31,288.34 and 8,378.93 is: 12,568.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.91 : 31,288.34 = 8,378.93 : x
  2. Step 2: Convert to fraction form
    20,858.91/31,288.34 = 8,378.93/x
  3. Step 3: Cross multiply
    20,858.91x = 31,288.34 × 8,378.93
  4. Step 4: Simplify right side
    20,858.91x = 262,162,768.78
  5. Step 5: Solve for x
    x = 262,162,768.78/20,858.91
  6. Step 6: Final answer
    x = 12,568.39

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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.