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Finding the Fourth Proportional to 2,639.13, 3,956.51 and 994.77

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Solution

The fourth proportional to 2,639.13, 3,956.51 and 994.77 is: 1,491.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.13 : 3,956.51 = 994.77 : x
  2. Step 2: Convert to fraction form
    2,639.13/3,956.51 = 994.77/x
  3. Step 3: Cross multiply
    2,639.13x = 3,956.51 × 994.77
  4. Step 4: Simplify right side
    2,639.13x = 3,935,812.48
  5. Step 5: Solve for x
    x = 3,935,812.48/2,639.13
  6. Step 6: Final answer
    x = 1,491.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.