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Finding the Fourth Proportional to 73,139.52, 109,709.76 and 20,550

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Solution

The fourth proportional to 73,139.52, 109,709.76 and 20,550 is: 30,825.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,139.52 : 109,709.76 = 20,550 : x
  2. Step 2: Convert to fraction form
    73,139.52/109,709.76 = 20,550/x
  3. Step 3: Cross multiply
    73,139.52x = 109,709.76 × 20,550
  4. Step 4: Simplify right side
    73,139.52x = 2,254,535,568
  5. Step 5: Solve for x
    x = 2,254,535,568/73,139.52
  6. Step 6: Final answer
    x = 30,825.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.