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Finding the Fourth Proportional to 76.55, 114.75 and 28.43

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Solution

The fourth proportional to 76.55, 114.75 and 28.43 is: 42.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.55 : 114.75 = 28.43 : x
  2. Step 2: Convert to fraction form
    76.55/114.75 = 28.43/x
  3. Step 3: Cross multiply
    76.55x = 114.75 × 28.43
  4. Step 4: Simplify right side
    76.55x = 3,261.77
  5. Step 5: Solve for x
    x = 3,261.77/76.55
  6. Step 6: Final answer
    x = 42.61

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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.