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Finding the Fourth Proportional to 276.16, 381.28 and 188.80

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Solution

The fourth proportional to 276.16, 381.28 and 188.80 is: 260.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.16 : 381.28 = 188.80 : x
  2. Step 2: Convert to fraction form
    276.16/381.28 = 188.80/x
  3. Step 3: Cross multiply
    276.16x = 381.28 × 188.80
  4. Step 4: Simplify right side
    276.16x = 71,985.66
  5. Step 5: Solve for x
    x = 71,985.66/276.16
  6. Step 6: Final answer
    x = 260.67

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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.