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Finding the Fourth Proportional to 6,622.40, 9,138.34 and 3,789.20

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Solution

The fourth proportional to 6,622.40, 9,138.34 and 3,789.20 is: 5,228.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,622.40 : 9,138.34 = 3,789.20 : x
  2. Step 2: Convert to fraction form
    6,622.40/9,138.34 = 3,789.20/x
  3. Step 3: Cross multiply
    6,622.40x = 9,138.34 × 3,789.20
  4. Step 4: Simplify right side
    6,622.40x = 34,626,997.93
  5. Step 5: Solve for x
    x = 34,626,997.93/6,622.40
  6. Step 6: Final answer
    x = 5,228.77

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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.