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Finding the Fourth Proportional to 256.38, 384.03 and 148.11

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Solution

The fourth proportional to 256.38, 384.03 and 148.11 is: 221.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.38 : 384.03 = 148.11 : x
  2. Step 2: Convert to fraction form
    256.38/384.03 = 148.11/x
  3. Step 3: Cross multiply
    256.38x = 384.03 × 148.11
  4. Step 4: Simplify right side
    256.38x = 56,878.68
  5. Step 5: Solve for x
    x = 56,878.68/256.38
  6. Step 6: Final answer
    x = 221.85

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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.