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Finding the Fourth Proportional to 74.52, 111.89 and 54.35

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Solution

The fourth proportional to 74.52, 111.89 and 54.35 is: 81.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.52 : 111.89 = 54.35 : x
  2. Step 2: Convert to fraction form
    74.52/111.89 = 54.35/x
  3. Step 3: Cross multiply
    74.52x = 111.89 × 54.35
  4. Step 4: Simplify right side
    74.52x = 6,080.39
  5. Step 5: Solve for x
    x = 6,080.39/74.52
  6. Step 6: Final answer
    x = 81.59

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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.