Home / 20,861.88-28,789.39-11,430.66

Finding the Fourth Proportional to 20,861.88, 28,789.39 and 11,430.66

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Solution

The fourth proportional to 20,861.88, 28,789.39 and 11,430.66 is: 15,774.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.88 : 28,789.39 = 11,430.66 : x
  2. Step 2: Convert to fraction form
    20,861.88/28,789.39 = 11,430.66/x
  3. Step 3: Cross multiply
    20,861.88x = 28,789.39 × 11,430.66
  4. Step 4: Simplify right side
    20,861.88x = 329,081,556.17
  5. Step 5: Solve for x
    x = 329,081,556.17/20,861.88
  6. Step 6: Final answer
    x = 15,774.30

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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.