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Finding the Fourth Proportional to 76.89, 114.59 and 72.75

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Solution

The fourth proportional to 76.89, 114.59 and 72.75 is: 108.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.89 : 114.59 = 72.75 : x
  2. Step 2: Convert to fraction form
    76.89/114.59 = 72.75/x
  3. Step 3: Cross multiply
    76.89x = 114.59 × 72.75
  4. Step 4: Simplify right side
    76.89x = 8,336.06
  5. Step 5: Solve for x
    x = 8,336.06/76.89
  6. Step 6: Final answer
    x = 108.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.