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Finding the Fourth Proportional to 256.80, 354.32 and 153.28

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Solution

The fourth proportional to 256.80, 354.32 and 153.28 is: 211.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.80 : 354.32 = 153.28 : x
  2. Step 2: Convert to fraction form
    256.80/354.32 = 153.28/x
  3. Step 3: Cross multiply
    256.80x = 354.32 × 153.28
  4. Step 4: Simplify right side
    256.80x = 54,310.17
  5. Step 5: Solve for x
    x = 54,310.17/256.80
  6. Step 6: Final answer
    x = 211.49

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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.