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Finding the Fourth Proportional to 256.91, 385.36 and 64.54

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Solution

The fourth proportional to 256.91, 385.36 and 64.54 is: 96.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.91 : 385.36 = 64.54 : x
  2. Step 2: Convert to fraction form
    256.91/385.36 = 64.54/x
  3. Step 3: Cross multiply
    256.91x = 385.36 × 64.54
  4. Step 4: Simplify right side
    256.91x = 24,869.21
  5. Step 5: Solve for x
    x = 24,869.21/256.91
  6. Step 6: Final answer
    x = 96.80

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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.