Home / 15,379.88-21,224.30-8,920.79

Finding the Fourth Proportional to 15,379.88, 21,224.30 and 8,920.79

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Solution

The fourth proportional to 15,379.88, 21,224.30 and 8,920.79 is: 12,310.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,379.88 : 21,224.30 = 8,920.79 : x
  2. Step 2: Convert to fraction form
    15,379.88/21,224.30 = 8,920.79/x
  3. Step 3: Cross multiply
    15,379.88x = 21,224.30 × 8,920.79
  4. Step 4: Simplify right side
    15,379.88x = 189,337,372.47
  5. Step 5: Solve for x
    x = 189,337,372.47/15,379.88
  6. Step 6: Final answer
    x = 12,310.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.