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Finding the Fourth Proportional to 256.88, 385.56 and 143.12

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Solution

The fourth proportional to 256.88, 385.56 and 143.12 is: 214.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.88 : 385.56 = 143.12 : x
  2. Step 2: Convert to fraction form
    256.88/385.56 = 143.12/x
  3. Step 3: Cross multiply
    256.88x = 385.56 × 143.12
  4. Step 4: Simplify right side
    256.88x = 55,181.35
  5. Step 5: Solve for x
    x = 55,181.35/256.88
  6. Step 6: Final answer
    x = 214.81

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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.