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Finding the Fourth Proportional to 174.64, 261.93 and 71.86

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Solution

The fourth proportional to 174.64, 261.93 and 71.86 is: 107.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.64 : 261.93 = 71.86 : x
  2. Step 2: Convert to fraction form
    174.64/261.93 = 71.86/x
  3. Step 3: Cross multiply
    174.64x = 261.93 × 71.86
  4. Step 4: Simplify right side
    174.64x = 18,822.29
  5. Step 5: Solve for x
    x = 18,822.29/174.64
  6. Step 6: Final answer
    x = 107.78

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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.