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Finding the Fourth Proportional to 6,628.77, 9,146.79 and 3,939.30

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Solution

The fourth proportional to 6,628.77, 9,146.79 and 3,939.30 is: 5,435.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,628.77 : 9,146.79 = 3,939.30 : x
  2. Step 2: Convert to fraction form
    6,628.77/9,146.79 = 3,939.30/x
  3. Step 3: Cross multiply
    6,628.77x = 9,146.79 × 3,939.30
  4. Step 4: Simplify right side
    6,628.77x = 36,031,949.85
  5. Step 5: Solve for x
    x = 36,031,949.85/6,628.77
  6. Step 6: Final answer
    x = 5,435.69

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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.