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Finding the Fourth Proportional to 276.65, 415.03 and 81.64

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Solution

The fourth proportional to 276.65, 415.03 and 81.64 is: 122.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.65 : 415.03 = 81.64 : x
  2. Step 2: Convert to fraction form
    276.65/415.03 = 81.64/x
  3. Step 3: Cross multiply
    276.65x = 415.03 × 81.64
  4. Step 4: Simplify right side
    276.65x = 33,881.81
  5. Step 5: Solve for x
    x = 33,881.81/276.65
  6. Step 6: Final answer
    x = 122.47

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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.