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Finding the Fourth Proportional to 76.55, 114.74 and 68.95

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Solution

The fourth proportional to 76.55, 114.74 and 68.95 is: 103.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.55 : 114.74 = 68.95 : x
  2. Step 2: Convert to fraction form
    76.55/114.74 = 68.95/x
  3. Step 3: Cross multiply
    76.55x = 114.74 × 68.95
  4. Step 4: Simplify right side
    76.55x = 7,911.57
  5. Step 5: Solve for x
    x = 7,911.57/76.55
  6. Step 6: Final answer
    x = 103.36

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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.