Home / 20,861.69-28,789.11-11,430.26

Finding the Fourth Proportional to 20,861.69, 28,789.11 and 11,430.26

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Solution

The fourth proportional to 20,861.69, 28,789.11 and 11,430.26 is: 15,773.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.69 : 28,789.11 = 11,430.26 : x
  2. Step 2: Convert to fraction form
    20,861.69/28,789.11 = 11,430.26/x
  3. Step 3: Cross multiply
    20,861.69x = 28,789.11 × 11,430.26
  4. Step 4: Simplify right side
    20,861.69x = 329,067,012.47
  5. Step 5: Solve for x
    x = 329,067,012.47/20,861.69
  6. Step 6: Final answer
    x = 15,773.75

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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.