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Finding the Fourth Proportional to 256.32, 383.44 and 220.68

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Solution

The fourth proportional to 256.32, 383.44 and 220.68 is: 330.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.32 : 383.44 = 220.68 : x
  2. Step 2: Convert to fraction form
    256.32/383.44 = 220.68/x
  3. Step 3: Cross multiply
    256.32x = 383.44 × 220.68
  4. Step 4: Simplify right side
    256.32x = 84,617.54
  5. Step 5: Solve for x
    x = 84,617.54/256.32
  6. Step 6: Final answer
    x = 330.12

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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.