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Finding the Fourth Proportional to 1,629.87, 2,249.08 and 921.78

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Solution

The fourth proportional to 1,629.87, 2,249.08 and 921.78 is: 1,271.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,629.87 : 2,249.08 = 921.78 : x
  2. Step 2: Convert to fraction form
    1,629.87/2,249.08 = 921.78/x
  3. Step 3: Cross multiply
    1,629.87x = 2,249.08 × 921.78
  4. Step 4: Simplify right side
    1,629.87x = 2,073,156.96
  5. Step 5: Solve for x
    x = 2,073,156.96/1,629.87
  6. Step 6: Final answer
    x = 1,271.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.