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Finding the Fourth Proportional to 76.28, 113.78 and 73.48

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Solution

The fourth proportional to 76.28, 113.78 and 73.48 is: 109.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.28 : 113.78 = 73.48 : x
  2. Step 2: Convert to fraction form
    76.28/113.78 = 73.48/x
  3. Step 3: Cross multiply
    76.28x = 113.78 × 73.48
  4. Step 4: Simplify right side
    76.28x = 8,360.55
  5. Step 5: Solve for x
    x = 8,360.55/76.28
  6. Step 6: Final answer
    x = 109.60

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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.