Home / 20,861.76-28,788.61-11,430.12

Finding the Fourth Proportional to 20,861.76, 28,788.61 and 11,430.12

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Solution

The fourth proportional to 20,861.76, 28,788.61 and 11,430.12 is: 15,773.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.76 : 28,788.61 = 11,430.12 : x
  2. Step 2: Convert to fraction form
    20,861.76/28,788.61 = 11,430.12/x
  3. Step 3: Cross multiply
    20,861.76x = 28,788.61 × 11,430.12
  4. Step 4: Simplify right side
    20,861.76x = 329,057,266.93
  5. Step 5: Solve for x
    x = 329,057,266.93/20,861.76
  6. Step 6: Final answer
    x = 15,773.23

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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.