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Finding the Fourth Proportional to 76.07, 104.85 and 54.20

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Solution

The fourth proportional to 76.07, 104.85 and 54.20 is: 74.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.07 : 104.85 = 54.20 : x
  2. Step 2: Convert to fraction form
    76.07/104.85 = 54.20/x
  3. Step 3: Cross multiply
    76.07x = 104.85 × 54.20
  4. Step 4: Simplify right side
    76.07x = 5,682.87
  5. Step 5: Solve for x
    x = 5,682.87/76.07
  6. Step 6: Final answer
    x = 74.71

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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.