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Finding the Fourth Proportional to 76.42, 114.61 and 28.30

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Solution

The fourth proportional to 76.42, 114.61 and 28.30 is: 42.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.42 : 114.61 = 28.30 : x
  2. Step 2: Convert to fraction form
    76.42/114.61 = 28.30/x
  3. Step 3: Cross multiply
    76.42x = 114.61 × 28.30
  4. Step 4: Simplify right side
    76.42x = 3,242.75
  5. Step 5: Solve for x
    x = 3,242.75/76.42
  6. Step 6: Final answer
    x = 42.44

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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.