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Finding the Fourth Proportional to 3,918.99, 5,874.10 and 2,991.47

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Solution

The fourth proportional to 3,918.99, 5,874.10 and 2,991.47 is: 4,483.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.99 : 5,874.10 = 2,991.47 : x
  2. Step 2: Convert to fraction form
    3,918.99/5,874.10 = 2,991.47/x
  3. Step 3: Cross multiply
    3,918.99x = 5,874.10 × 2,991.47
  4. Step 4: Simplify right side
    3,918.99x = 17,572,201.13
  5. Step 5: Solve for x
    x = 17,572,201.13/3,918.99
  6. Step 6: Final answer
    x = 4,483.86

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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.