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Finding the Fourth Proportional to 3,910.75, 5,866.11 and 1,315.51

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Solution

The fourth proportional to 3,910.75, 5,866.11 and 1,315.51 is: 1,973.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,910.75 : 5,866.11 = 1,315.51 : x
  2. Step 2: Convert to fraction form
    3,910.75/5,866.11 = 1,315.51/x
  3. Step 3: Cross multiply
    3,910.75x = 5,866.11 × 1,315.51
  4. Step 4: Simplify right side
    3,910.75x = 7,716,911.70
  5. Step 5: Solve for x
    x = 7,716,911.70/3,910.75
  6. Step 6: Final answer
    x = 1,973.26

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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.