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Finding the Fourth Proportional to 272.16, 374.68 and 253.78

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Solution

The fourth proportional to 272.16, 374.68 and 253.78 is: 349.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.16 : 374.68 = 253.78 : x
  2. Step 2: Convert to fraction form
    272.16/374.68 = 253.78/x
  3. Step 3: Cross multiply
    272.16x = 374.68 × 253.78
  4. Step 4: Simplify right side
    272.16x = 95,086.35
  5. Step 5: Solve for x
    x = 95,086.35/272.16
  6. Step 6: Final answer
    x = 349.38

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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.