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Finding the Fourth Proportional to 76.39, 105.47 and 68.19

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Solution

The fourth proportional to 76.39, 105.47 and 68.19 is: 94.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.39 : 105.47 = 68.19 : x
  2. Step 2: Convert to fraction form
    76.39/105.47 = 68.19/x
  3. Step 3: Cross multiply
    76.39x = 105.47 × 68.19
  4. Step 4: Simplify right side
    76.39x = 7,192.30
  5. Step 5: Solve for x
    x = 7,192.30/76.39
  6. Step 6: Final answer
    x = 94.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.