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Finding the Fourth Proportional to 256.64, 386.40 and 226.40

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Solution

The fourth proportional to 256.64, 386.40 and 226.40 is: 340.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.64 : 386.40 = 226.40 : x
  2. Step 2: Convert to fraction form
    256.64/386.40 = 226.40/x
  3. Step 3: Cross multiply
    256.64x = 386.40 × 226.40
  4. Step 4: Simplify right side
    256.64x = 87,480.96
  5. Step 5: Solve for x
    x = 87,480.96/256.64
  6. Step 6: Final answer
    x = 340.87

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.