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Finding the Fourth Proportional to 3,705.78, 5,115.71 and 2,447.81

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Solution

The fourth proportional to 3,705.78, 5,115.71 and 2,447.81 is: 3,379.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,705.78 : 5,115.71 = 2,447.81 : x
  2. Step 2: Convert to fraction form
    3,705.78/5,115.71 = 2,447.81/x
  3. Step 3: Cross multiply
    3,705.78x = 5,115.71 × 2,447.81
  4. Step 4: Simplify right side
    3,705.78x = 12,522,248.28
  5. Step 5: Solve for x
    x = 12,522,248.28/3,705.78
  6. Step 6: Final answer
    x = 3,379.11

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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.