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Finding the Fourth Proportional to 3,910.78, 5,866.22 and 1,313.72

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Solution

The fourth proportional to 3,910.78, 5,866.22 and 1,313.72 is: 1,970.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,910.78 : 5,866.22 = 1,313.72 : x
  2. Step 2: Convert to fraction form
    3,910.78/5,866.22 = 1,313.72/x
  3. Step 3: Cross multiply
    3,910.78x = 5,866.22 × 1,313.72
  4. Step 4: Simplify right side
    3,910.78x = 7,706,566.49
  5. Step 5: Solve for x
    x = 7,706,566.49/3,910.78
  6. Step 6: Final answer
    x = 1,970.60

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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.