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Finding the Fourth Proportional to 276.98, 415.50 and 261.14

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Solution

The fourth proportional to 276.98, 415.50 and 261.14 is: 391.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.98 : 415.50 = 261.14 : x
  2. Step 2: Convert to fraction form
    276.98/415.50 = 261.14/x
  3. Step 3: Cross multiply
    276.98x = 415.50 × 261.14
  4. Step 4: Simplify right side
    276.98x = 108,503.67
  5. Step 5: Solve for x
    x = 108,503.67/276.98
  6. Step 6: Final answer
    x = 391.74

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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.