Home / 21,221.26-31,790.27-12,317.89

Finding the Fourth Proportional to 21,221.26, 31,790.27 and 12,317.89

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Solution

The fourth proportional to 21,221.26, 31,790.27 and 12,317.89 is: 18,452.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,221.26 : 31,790.27 = 12,317.89 : x
  2. Step 2: Convert to fraction form
    21,221.26/31,790.27 = 12,317.89/x
  3. Step 3: Cross multiply
    21,221.26x = 31,790.27 × 12,317.89
  4. Step 4: Simplify right side
    21,221.26x = 391,589,059.86
  5. Step 5: Solve for x
    x = 391,589,059.86/21,221.26
  6. Step 6: Final answer
    x = 18,452.68

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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.