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Finding the Fourth Proportional to 20,646.78, 28,491.75 and 11,694.78

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Solution

The fourth proportional to 20,646.78, 28,491.75 and 11,694.78 is: 16,138.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,646.78 : 28,491.75 = 11,694.78 : x
  2. Step 2: Convert to fraction form
    20,646.78/28,491.75 = 11,694.78/x
  3. Step 3: Cross multiply
    20,646.78x = 28,491.75 × 11,694.78
  4. Step 4: Simplify right side
    20,646.78x = 333,204,748.07
  5. Step 5: Solve for x
    x = 333,204,748.07/20,646.78
  6. Step 6: Final answer
    x = 16,138.34

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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.