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Finding the Fourth Proportional to 256.40, 384.30 and 165.28

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Solution

The fourth proportional to 256.40, 384.30 and 165.28 is: 247.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.40 : 384.30 = 165.28 : x
  2. Step 2: Convert to fraction form
    256.40/384.30 = 165.28/x
  3. Step 3: Cross multiply
    256.40x = 384.30 × 165.28
  4. Step 4: Simplify right side
    256.40x = 63,517.10
  5. Step 5: Solve for x
    x = 63,517.10/256.40
  6. Step 6: Final answer
    x = 247.73

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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.