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Finding the Fourth Proportional to 279.33, 387.10 and 275.41

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Solution

The fourth proportional to 279.33, 387.10 and 275.41 is: 381.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.33 : 387.10 = 275.41 : x
  2. Step 2: Convert to fraction form
    279.33/387.10 = 275.41/x
  3. Step 3: Cross multiply
    279.33x = 387.10 × 275.41
  4. Step 4: Simplify right side
    279.33x = 106,611.21
  5. Step 5: Solve for x
    x = 106,611.21/279.33
  6. Step 6: Final answer
    x = 381.67

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.