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Finding the Fourth Proportional to 275.27, 412.90 and 69.84

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Solution

The fourth proportional to 275.27, 412.90 and 69.84 is: 104.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.27 : 412.90 = 69.84 : x
  2. Step 2: Convert to fraction form
    275.27/412.90 = 69.84/x
  3. Step 3: Cross multiply
    275.27x = 412.90 × 69.84
  4. Step 4: Simplify right side
    275.27x = 28,836.76
  5. Step 5: Solve for x
    x = 28,836.76/275.27
  6. Step 6: Final answer
    x = 104.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.