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Finding the Fourth Proportional to 276.79, 415.28 and 130.53

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Solution

The fourth proportional to 276.79, 415.28 and 130.53 is: 195.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.79 : 415.28 = 130.53 : x
  2. Step 2: Convert to fraction form
    276.79/415.28 = 130.53/x
  3. Step 3: Cross multiply
    276.79x = 415.28 × 130.53
  4. Step 4: Simplify right side
    276.79x = 54,208.38
  5. Step 5: Solve for x
    x = 54,208.38/276.79
  6. Step 6: Final answer
    x = 195.85

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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.