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Finding the Fourth Proportional to 256.82, 353.29 and 225.17

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Solution

The fourth proportional to 256.82, 353.29 and 225.17 is: 309.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.82 : 353.29 = 225.17 : x
  2. Step 2: Convert to fraction form
    256.82/353.29 = 225.17/x
  3. Step 3: Cross multiply
    256.82x = 353.29 × 225.17
  4. Step 4: Simplify right side
    256.82x = 79,547.85
  5. Step 5: Solve for x
    x = 79,547.85/256.82
  6. Step 6: Final answer
    x = 309.75

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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.