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Finding the Fourth Proportional to 179.21, 247.31 and 100.54

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Solution

The fourth proportional to 179.21, 247.31 and 100.54 is: 138.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.21 : 247.31 = 100.54 : x
  2. Step 2: Convert to fraction form
    179.21/247.31 = 100.54/x
  3. Step 3: Cross multiply
    179.21x = 247.31 × 100.54
  4. Step 4: Simplify right side
    179.21x = 24,865.27
  5. Step 5: Solve for x
    x = 24,865.27/179.21
  6. Step 6: Final answer
    x = 138.75

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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.