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Finding the Fourth Proportional to 3,471.78, 4,790.84 and 1,979.66

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Solution

The fourth proportional to 3,471.78, 4,790.84 and 1,979.66 is: 2,731.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,471.78 : 4,790.84 = 1,979.66 : x
  2. Step 2: Convert to fraction form
    3,471.78/4,790.84 = 1,979.66/x
  3. Step 3: Cross multiply
    3,471.78x = 4,790.84 × 1,979.66
  4. Step 4: Simplify right side
    3,471.78x = 9,484,234.31
  5. Step 5: Solve for x
    x = 9,484,234.31/3,471.78
  6. Step 6: Final answer
    x = 2,731.81

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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.