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Finding the Fourth Proportional to 849.91, 1,274.88 and 272.78

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Solution

The fourth proportional to 849.91, 1,274.88 and 272.78 is: 409.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.91 : 1,274.88 = 272.78 : x
  2. Step 2: Convert to fraction form
    849.91/1,274.88 = 272.78/x
  3. Step 3: Cross multiply
    849.91x = 1,274.88 × 272.78
  4. Step 4: Simplify right side
    849.91x = 347,760.40
  5. Step 5: Solve for x
    x = 347,760.40/849.91
  6. Step 6: Final answer
    x = 409.18

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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.