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Finding the Fourth Proportional to 256.73, 354.69 and 215.21

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Solution

The fourth proportional to 256.73, 354.69 and 215.21 is: 297.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.73 : 354.69 = 215.21 : x
  2. Step 2: Convert to fraction form
    256.73/354.69 = 215.21/x
  3. Step 3: Cross multiply
    256.73x = 354.69 × 215.21
  4. Step 4: Simplify right side
    256.73x = 76,331.76
  5. Step 5: Solve for x
    x = 76,331.76/256.73
  6. Step 6: Final answer
    x = 297.32

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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.