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Finding the Fourth Proportional to 174.86, 262.35 and 72.20

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Solution

The fourth proportional to 174.86, 262.35 and 72.20 is: 108.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.86 : 262.35 = 72.20 : x
  2. Step 2: Convert to fraction form
    174.86/262.35 = 72.20/x
  3. Step 3: Cross multiply
    174.86x = 262.35 × 72.20
  4. Step 4: Simplify right side
    174.86x = 18,940.95
  5. Step 5: Solve for x
    x = 18,940.95/174.86
  6. Step 6: Final answer
    x = 108.32

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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.