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Finding the Fourth Proportional to 256.96, 385.60 and 230.40

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Solution

The fourth proportional to 256.96, 385.60 and 230.40 is: 345.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.96 : 385.60 = 230.40 : x
  2. Step 2: Convert to fraction form
    256.96/385.60 = 230.40/x
  3. Step 3: Cross multiply
    256.96x = 385.60 × 230.40
  4. Step 4: Simplify right side
    256.96x = 88,842.24
  5. Step 5: Solve for x
    x = 88,842.24/256.96
  6. Step 6: Final answer
    x = 345.74

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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.