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Finding the Fourth Proportional to 20,920.54, 28,869.57 and 11,488.54

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Solution

The fourth proportional to 20,920.54, 28,869.57 and 11,488.54 is: 15,853.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.54 : 28,869.57 = 11,488.54 : x
  2. Step 2: Convert to fraction form
    20,920.54/28,869.57 = 11,488.54/x
  3. Step 3: Cross multiply
    20,920.54x = 28,869.57 × 11,488.54
  4. Step 4: Simplify right side
    20,920.54x = 331,669,209.73
  5. Step 5: Solve for x
    x = 331,669,209.73/20,920.54
  6. Step 6: Final answer
    x = 15,853.76

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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.