Home / 20,379.68-28,129.96-13,307.20

Finding the Fourth Proportional to 20,379.68, 28,129.96 and 13,307.20

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Solution

The fourth proportional to 20,379.68, 28,129.96 and 13,307.20 is: 18,367.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.68 : 28,129.96 = 13,307.20 : x
  2. Step 2: Convert to fraction form
    20,379.68/28,129.96 = 13,307.20/x
  3. Step 3: Cross multiply
    20,379.68x = 28,129.96 × 13,307.20
  4. Step 4: Simplify right side
    20,379.68x = 374,331,003.71
  5. Step 5: Solve for x
    x = 374,331,003.71/20,379.68
  6. Step 6: Final answer
    x = 18,367.85

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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.