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Finding the Fourth Proportional to 20,379.69, 28,129.95 and 13,307.22

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Solution

The fourth proportional to 20,379.69, 28,129.95 and 13,307.22 is: 18,367.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.69 : 28,129.95 = 13,307.22 : x
  2. Step 2: Convert to fraction form
    20,379.69/28,129.95 = 13,307.22/x
  3. Step 3: Cross multiply
    20,379.69x = 28,129.95 × 13,307.22
  4. Step 4: Simplify right side
    20,379.69x = 374,331,433.24
  5. Step 5: Solve for x
    x = 374,331,433.24/20,379.69
  6. Step 6: Final answer
    x = 18,367.87

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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.