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Finding the Fourth Proportional to 76.66, 114.46 and 68.46

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Solution

The fourth proportional to 76.66, 114.46 and 68.46 is: 102.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.66 : 114.46 = 68.46 : x
  2. Step 2: Convert to fraction form
    76.66/114.46 = 68.46/x
  3. Step 3: Cross multiply
    76.66x = 114.46 × 68.46
  4. Step 4: Simplify right side
    76.66x = 7,835.93
  5. Step 5: Solve for x
    x = 7,835.93/76.66
  6. Step 6: Final answer
    x = 102.22

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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.