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Finding the Fourth Proportional to 256.73, 384.71 and 218.30

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Solution

The fourth proportional to 256.73, 384.71 and 218.30 is: 327.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.73 : 384.71 = 218.30 : x
  2. Step 2: Convert to fraction form
    256.73/384.71 = 218.30/x
  3. Step 3: Cross multiply
    256.73x = 384.71 × 218.30
  4. Step 4: Simplify right side
    256.73x = 83,979.18
  5. Step 5: Solve for x
    x = 83,979.18/256.73
  6. Step 6: Final answer
    x = 327.12

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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.