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Finding the Fourth Proportional to 256.64, 384.96 and 64.27

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Solution

The fourth proportional to 256.64, 384.96 and 64.27 is: 96.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.64 : 384.96 = 64.27 : x
  2. Step 2: Convert to fraction form
    256.64/384.96 = 64.27/x
  3. Step 3: Cross multiply
    256.64x = 384.96 × 64.27
  4. Step 4: Simplify right side
    256.64x = 24,740.42
  5. Step 5: Solve for x
    x = 24,740.42/256.64
  6. Step 6: Final answer
    x = 96.40

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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.