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Finding the Fourth Proportional to 179.30, 247.40 and 100.60

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Solution

The fourth proportional to 179.30, 247.40 and 100.60 is: 138.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.30 : 247.40 = 100.60 : x
  2. Step 2: Convert to fraction form
    179.30/247.40 = 100.60/x
  3. Step 3: Cross multiply
    179.30x = 247.40 × 100.60
  4. Step 4: Simplify right side
    179.30x = 24,888.44
  5. Step 5: Solve for x
    x = 24,888.44/179.30
  6. Step 6: Final answer
    x = 138.81

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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.