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Finding the Fourth Proportional to 256.94, 385.41 and 64.57

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Solution

The fourth proportional to 256.94, 385.41 and 64.57 is: 96.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.94 : 385.41 = 64.57 : x
  2. Step 2: Convert to fraction form
    256.94/385.41 = 64.57/x
  3. Step 3: Cross multiply
    256.94x = 385.41 × 64.57
  4. Step 4: Simplify right side
    256.94x = 24,885.92
  5. Step 5: Solve for x
    x = 24,885.92/256.94
  6. Step 6: Final answer
    x = 96.86

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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.