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Finding the Fourth Proportional to 76.43, 114.65 and 30.80

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Solution

The fourth proportional to 76.43, 114.65 and 30.80 is: 46.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.43 : 114.65 = 30.80 : x
  2. Step 2: Convert to fraction form
    76.43/114.65 = 30.80/x
  3. Step 3: Cross multiply
    76.43x = 114.65 × 30.80
  4. Step 4: Simplify right side
    76.43x = 3,531.22
  5. Step 5: Solve for x
    x = 3,531.22/76.43
  6. Step 6: Final answer
    x = 46.20

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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.