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Finding the Fourth Proportional to 20,645.72, 28,491.40 and 11,693

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Solution

The fourth proportional to 20,645.72, 28,491.40 and 11,693 is: 16,136.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.72 : 28,491.40 = 11,693 : x
  2. Step 2: Convert to fraction form
    20,645.72/28,491.40 = 11,693/x
  3. Step 3: Cross multiply
    20,645.72x = 28,491.40 × 11,693
  4. Step 4: Simplify right side
    20,645.72x = 333,149,940.20
  5. Step 5: Solve for x
    x = 333,149,940.20/20,645.72
  6. Step 6: Final answer
    x = 16,136.51

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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.