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Finding the Fourth Proportional to 256.50, 382.91 and 217.72

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Solution

The fourth proportional to 256.50, 382.91 and 217.72 is: 325.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.50 : 382.91 = 217.72 : x
  2. Step 2: Convert to fraction form
    256.50/382.91 = 217.72/x
  3. Step 3: Cross multiply
    256.50x = 382.91 × 217.72
  4. Step 4: Simplify right side
    256.50x = 83,367.17
  5. Step 5: Solve for x
    x = 83,367.17/256.50
  6. Step 6: Final answer
    x = 325.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.