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Finding the Fourth Proportional to 20,658.65, 28,509.17 and 11,227.21

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Solution

The fourth proportional to 20,658.65, 28,509.17 and 11,227.21 is: 15,493.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,658.65 : 28,509.17 = 11,227.21 : x
  2. Step 2: Convert to fraction form
    20,658.65/28,509.17 = 11,227.21/x
  3. Step 3: Cross multiply
    20,658.65x = 28,509.17 × 11,227.21
  4. Step 4: Simplify right side
    20,658.65x = 320,078,438.52
  5. Step 5: Solve for x
    x = 320,078,438.52/20,658.65
  6. Step 6: Final answer
    x = 15,493.68

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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.