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Finding the Fourth Proportional to 2,651.22, 3,977.64 and 921.06

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Solution

The fourth proportional to 2,651.22, 3,977.64 and 921.06 is: 1,381.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,651.22 : 3,977.64 = 921.06 : x
  2. Step 2: Convert to fraction form
    2,651.22/3,977.64 = 921.06/x
  3. Step 3: Cross multiply
    2,651.22x = 3,977.64 × 921.06
  4. Step 4: Simplify right side
    2,651.22x = 3,663,645.10
  5. Step 5: Solve for x
    x = 3,663,645.10/2,651.22
  6. Step 6: Final answer
    x = 1,381.87

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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.