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Finding the Fourth Proportional to 3,910.64, 5,865.88 and 1,137.20

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Solution

The fourth proportional to 3,910.64, 5,865.88 and 1,137.20 is: 1,705.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,910.64 : 5,865.88 = 1,137.20 : x
  2. Step 2: Convert to fraction form
    3,910.64/5,865.88 = 1,137.20/x
  3. Step 3: Cross multiply
    3,910.64x = 5,865.88 × 1,137.20
  4. Step 4: Simplify right side
    3,910.64x = 6,670,678.74
  5. Step 5: Solve for x
    x = 6,670,678.74/3,910.64
  6. Step 6: Final answer
    x = 1,705.78

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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.