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Finding the Fourth Proportional to 3,911.55, 5,866.10 and 1,313.88

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Solution

The fourth proportional to 3,911.55, 5,866.10 and 1,313.88 is: 1,970.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.55 : 5,866.10 = 1,313.88 : x
  2. Step 2: Convert to fraction form
    3,911.55/5,866.10 = 1,313.88/x
  3. Step 3: Cross multiply
    3,911.55x = 5,866.10 × 1,313.88
  4. Step 4: Simplify right side
    3,911.55x = 7,707,351.47
  5. Step 5: Solve for x
    x = 7,707,351.47/3,911.55
  6. Step 6: Final answer
    x = 1,970.41

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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.