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Finding the Fourth Proportional to 276.12, 381.04 and 151.78

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Solution

The fourth proportional to 276.12, 381.04 and 151.78 is: 209.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.12 : 381.04 = 151.78 : x
  2. Step 2: Convert to fraction form
    276.12/381.04 = 151.78/x
  3. Step 3: Cross multiply
    276.12x = 381.04 × 151.78
  4. Step 4: Simplify right side
    276.12x = 57,834.25
  5. Step 5: Solve for x
    x = 57,834.25/276.12
  6. Step 6: Final answer
    x = 209.45

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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.