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Finding the Fourth Proportional to 20,864.70, 28,791.70 and 11,910.99

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Solution

The fourth proportional to 20,864.70, 28,791.70 and 11,910.99 is: 16,436.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,864.70 : 28,791.70 = 11,910.99 : x
  2. Step 2: Convert to fraction form
    20,864.70/28,791.70 = 11,910.99/x
  3. Step 3: Cross multiply
    20,864.70x = 28,791.70 × 11,910.99
  4. Step 4: Simplify right side
    20,864.70x = 342,937,650.78
  5. Step 5: Solve for x
    x = 342,937,650.78/20,864.70
  6. Step 6: Final answer
    x = 16,436.26

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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.