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Finding the Fourth Proportional to 256.49, 384.56 and 217.81

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Solution

The fourth proportional to 256.49, 384.56 and 217.81 is: 326.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.49 : 384.56 = 217.81 : x
  2. Step 2: Convert to fraction form
    256.49/384.56 = 217.81/x
  3. Step 3: Cross multiply
    256.49x = 384.56 × 217.81
  4. Step 4: Simplify right side
    256.49x = 83,761.01
  5. Step 5: Solve for x
    x = 83,761.01/256.49
  6. Step 6: Final answer
    x = 326.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.