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Finding the Fourth Proportional to 3,410.56, 5,115.80 and 911.74

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Solution

The fourth proportional to 3,410.56, 5,115.80 and 911.74 is: 1,367.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,410.56 : 5,115.80 = 911.74 : x
  2. Step 2: Convert to fraction form
    3,410.56/5,115.80 = 911.74/x
  3. Step 3: Cross multiply
    3,410.56x = 5,115.80 × 911.74
  4. Step 4: Simplify right side
    3,410.56x = 4,664,279.49
  5. Step 5: Solve for x
    x = 4,664,279.49/3,410.56
  6. Step 6: Final answer
    x = 1,367.60

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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.