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Finding the Fourth Proportional to 11,901.72, 16,420.28 and 6,865.85

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Solution

The fourth proportional to 11,901.72, 16,420.28 and 6,865.85 is: 9,472.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,901.72 : 16,420.28 = 6,865.85 : x
  2. Step 2: Convert to fraction form
    11,901.72/16,420.28 = 6,865.85/x
  3. Step 3: Cross multiply
    11,901.72x = 16,420.28 × 6,865.85
  4. Step 4: Simplify right side
    11,901.72x = 112,739,179.44
  5. Step 5: Solve for x
    x = 112,739,179.44/11,901.72
  6. Step 6: Final answer
    x = 9,472.51

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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.