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Finding the Fourth Proportional to 276.75, 381.90 and 152.40

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Solution

The fourth proportional to 276.75, 381.90 and 152.40 is: 210.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.75 : 381.90 = 152.40 : x
  2. Step 2: Convert to fraction form
    276.75/381.90 = 152.40/x
  3. Step 3: Cross multiply
    276.75x = 381.90 × 152.40
  4. Step 4: Simplify right side
    276.75x = 58,201.56
  5. Step 5: Solve for x
    x = 58,201.56/276.75
  6. Step 6: Final answer
    x = 210.30

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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.