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Finding the Fourth Proportional to 20,502.78, 30,759 and 6,651.78

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Solution

The fourth proportional to 20,502.78, 30,759 and 6,651.78 is: 9,979.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,502.78 : 30,759 = 6,651.78 : x
  2. Step 2: Convert to fraction form
    20,502.78/30,759 = 6,651.78/x
  3. Step 3: Cross multiply
    20,502.78x = 30,759 × 6,651.78
  4. Step 4: Simplify right side
    20,502.78x = 204,602,101.02
  5. Step 5: Solve for x
    x = 204,602,101.02/20,502.78
  6. Step 6: Final answer
    x = 9,979.24

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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.