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Finding the Fourth Proportional to 256.29, 384.57 and 111.99

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Solution

The fourth proportional to 256.29, 384.57 and 111.99 is: 168.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.29 : 384.57 = 111.99 : x
  2. Step 2: Convert to fraction form
    256.29/384.57 = 111.99/x
  3. Step 3: Cross multiply
    256.29x = 384.57 × 111.99
  4. Step 4: Simplify right side
    256.29x = 43,067.99
  5. Step 5: Solve for x
    x = 43,067.99/256.29
  6. Step 6: Final answer
    x = 168.04

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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.