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Finding the Fourth Proportional to 256.88, 354.49 and 153.38

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Solution

The fourth proportional to 256.88, 354.49 and 153.38 is: 211.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.88 : 354.49 = 153.38 : x
  2. Step 2: Convert to fraction form
    256.88/354.49 = 153.38/x
  3. Step 3: Cross multiply
    256.88x = 354.49 × 153.38
  4. Step 4: Simplify right side
    256.88x = 54,369.90
  5. Step 5: Solve for x
    x = 54,369.90/256.88
  6. Step 6: Final answer
    x = 211.66

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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.