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Finding the Fourth Proportional to 8,638.05, 11,922.20 and 5,616.91

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Solution

The fourth proportional to 8,638.05, 11,922.20 and 5,616.91 is: 7,752.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.05 : 11,922.20 = 5,616.91 : x
  2. Step 2: Convert to fraction form
    8,638.05/11,922.20 = 5,616.91/x
  3. Step 3: Cross multiply
    8,638.05x = 11,922.20 × 5,616.91
  4. Step 4: Simplify right side
    8,638.05x = 66,965,924.40
  5. Step 5: Solve for x
    x = 66,965,924.40/8,638.05
  6. Step 6: Final answer
    x = 7,752.44

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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.