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Finding the Fourth Proportional to 256.32, 384.36 and 111.96

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Solution

The fourth proportional to 256.32, 384.36 and 111.96 is: 167.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.32 : 384.36 = 111.96 : x
  2. Step 2: Convert to fraction form
    256.32/384.36 = 111.96/x
  3. Step 3: Cross multiply
    256.32x = 384.36 × 111.96
  4. Step 4: Simplify right side
    256.32x = 43,032.95
  5. Step 5: Solve for x
    x = 43,032.95/256.32
  6. Step 6: Final answer
    x = 167.89

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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.