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Finding the Fourth Proportional to 256.31, 383.89 and 118.94

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Solution

The fourth proportional to 256.31, 383.89 and 118.94 is: 178.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.31 : 383.89 = 118.94 : x
  2. Step 2: Convert to fraction form
    256.31/383.89 = 118.94/x
  3. Step 3: Cross multiply
    256.31x = 383.89 × 118.94
  4. Step 4: Simplify right side
    256.31x = 45,659.88
  5. Step 5: Solve for x
    x = 45,659.88/256.31
  6. Step 6: Final answer
    x = 178.14

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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.