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Finding the Fourth Proportional to 76.28, 114.55 and 68.45

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Solution

The fourth proportional to 76.28, 114.55 and 68.45 is: 102.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.28 : 114.55 = 68.45 : x
  2. Step 2: Convert to fraction form
    76.28/114.55 = 68.45/x
  3. Step 3: Cross multiply
    76.28x = 114.55 × 68.45
  4. Step 4: Simplify right side
    76.28x = 7,840.20
  5. Step 5: Solve for x
    x = 7,840.20/76.28
  6. Step 6: Final answer
    x = 102.79

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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.