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Finding the Fourth Proportional to 20,356, 30,531.56 and 8,672.56

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Solution

The fourth proportional to 20,356, 30,531.56 and 8,672.56 is: 13,007.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,356 : 30,531.56 = 8,672.56 : x
  2. Step 2: Convert to fraction form
    20,356/30,531.56 = 8,672.56/x
  3. Step 3: Cross multiply
    20,356x = 30,531.56 × 8,672.56
  4. Step 4: Simplify right side
    20,356x = 264,786,785.99
  5. Step 5: Solve for x
    x = 264,786,785.99/20,356
  6. Step 6: Final answer
    x = 13,007.80

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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.