Home / 20,918.72-31,379.52-8,438.85

Finding the Fourth Proportional to 20,918.72, 31,379.52 and 8,438.85

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Solution

The fourth proportional to 20,918.72, 31,379.52 and 8,438.85 is: 12,658.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.72 : 31,379.52 = 8,438.85 : x
  2. Step 2: Convert to fraction form
    20,918.72/31,379.52 = 8,438.85/x
  3. Step 3: Cross multiply
    20,918.72x = 31,379.52 × 8,438.85
  4. Step 4: Simplify right side
    20,918.72x = 264,806,863.26
  5. Step 5: Solve for x
    x = 264,806,863.26/20,918.72
  6. Step 6: Final answer
    x = 12,658.85

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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.