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Finding the Fourth Proportional to 276.32, 381.20 and 165.76

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Solution

The fourth proportional to 276.32, 381.20 and 165.76 is: 228.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.32 : 381.20 = 165.76 : x
  2. Step 2: Convert to fraction form
    276.32/381.20 = 165.76/x
  3. Step 3: Cross multiply
    276.32x = 381.20 × 165.76
  4. Step 4: Simplify right side
    276.32x = 63,187.71
  5. Step 5: Solve for x
    x = 63,187.71/276.32
  6. Step 6: Final answer
    x = 228.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.