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Finding the Fourth Proportional to 849.72, 1,274.34 and 272.28

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Solution

The fourth proportional to 849.72, 1,274.34 and 272.28 is: 408.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.72 : 1,274.34 = 272.28 : x
  2. Step 2: Convert to fraction form
    849.72/1,274.34 = 272.28/x
  3. Step 3: Cross multiply
    849.72x = 1,274.34 × 272.28
  4. Step 4: Simplify right side
    849.72x = 346,977.30
  5. Step 5: Solve for x
    x = 346,977.30/849.72
  6. Step 6: Final answer
    x = 408.34

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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.