Home / 20,581.89-28,403.14-11,150.45

Finding the Fourth Proportional to 20,581.89, 28,403.14 and 11,150.45

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Solution

The fourth proportional to 20,581.89, 28,403.14 and 11,150.45 is: 15,387.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,581.89 : 28,403.14 = 11,150.45 : x
  2. Step 2: Convert to fraction form
    20,581.89/28,403.14 = 11,150.45/x
  3. Step 3: Cross multiply
    20,581.89x = 28,403.14 × 11,150.45
  4. Step 4: Simplify right side
    20,581.89x = 316,707,749.94
  5. Step 5: Solve for x
    x = 316,707,749.94/20,581.89
  6. Step 6: Final answer
    x = 15,387.69

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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.