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Finding the Fourth Proportional to 256.96, 384.56 and 159.42

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Solution

The fourth proportional to 256.96, 384.56 and 159.42 is: 238.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.96 : 384.56 = 159.42 : x
  2. Step 2: Convert to fraction form
    256.96/384.56 = 159.42/x
  3. Step 3: Cross multiply
    256.96x = 384.56 × 159.42
  4. Step 4: Simplify right side
    256.96x = 61,306.56
  5. Step 5: Solve for x
    x = 61,306.56/256.96
  6. Step 6: Final answer
    x = 238.58

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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.