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Finding the Fourth Proportional to 76.39, 113.54 and 69.50

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Solution

The fourth proportional to 76.39, 113.54 and 69.50 is: 103.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.39 : 113.54 = 69.50 : x
  2. Step 2: Convert to fraction form
    76.39/113.54 = 69.50/x
  3. Step 3: Cross multiply
    76.39x = 113.54 × 69.50
  4. Step 4: Simplify right side
    76.39x = 7,891.03
  5. Step 5: Solve for x
    x = 7,891.03/76.39
  6. Step 6: Final answer
    x = 103.30

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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.