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Finding the Fourth Proportional to 1,629.84, 2,249.22 and 921.55

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Solution

The fourth proportional to 1,629.84, 2,249.22 and 921.55 is: 1,271.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,629.84 : 2,249.22 = 921.55 : x
  2. Step 2: Convert to fraction form
    1,629.84/2,249.22 = 921.55/x
  3. Step 3: Cross multiply
    1,629.84x = 2,249.22 × 921.55
  4. Step 4: Simplify right side
    1,629.84x = 2,072,768.69
  5. Step 5: Solve for x
    x = 2,072,768.69/1,629.84
  6. Step 6: Final answer
    x = 1,271.76

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1.5x scale

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.