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Finding the Fourth Proportional to 20,658.70, 28,508.92 and 11,707.92

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Solution

The fourth proportional to 20,658.70, 28,508.92 and 11,707.92 is: 16,156.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,658.70 : 28,508.92 = 11,707.92 : x
  2. Step 2: Convert to fraction form
    20,658.70/28,508.92 = 11,707.92/x
  3. Step 3: Cross multiply
    20,658.70x = 28,508.92 × 11,707.92
  4. Step 4: Simplify right side
    20,658.70x = 333,780,154.65
  5. Step 5: Solve for x
    x = 333,780,154.65/20,658.70
  6. Step 6: Final answer
    x = 16,156.88

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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.