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Finding the Fourth Proportional to 257.28, 355.08 and 153.78

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Solution

The fourth proportional to 257.28, 355.08 and 153.78 is: 212.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.28 : 355.08 = 153.78 : x
  2. Step 2: Convert to fraction form
    257.28/355.08 = 153.78/x
  3. Step 3: Cross multiply
    257.28x = 355.08 × 153.78
  4. Step 4: Simplify right side
    257.28x = 54,604.20
  5. Step 5: Solve for x
    x = 54,604.20/257.28
  6. Step 6: Final answer
    x = 212.24

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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.