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Finding the Fourth Proportional to 6,138.78, 8,472.61 and 3,620.74

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Solution

The fourth proportional to 6,138.78, 8,472.61 and 3,620.74 is: 4,997.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,138.78 : 8,472.61 = 3,620.74 : x
  2. Step 2: Convert to fraction form
    6,138.78/8,472.61 = 3,620.74/x
  3. Step 3: Cross multiply
    6,138.78x = 8,472.61 × 3,620.74
  4. Step 4: Simplify right side
    6,138.78x = 30,677,117.93
  5. Step 5: Solve for x
    x = 30,677,117.93/6,138.78
  6. Step 6: Final answer
    x = 4,997.27

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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.