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Finding the Fourth Proportional to 174.21, 261.31 and 71.47

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Solution

The fourth proportional to 174.21, 261.31 and 71.47 is: 107.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.21 : 261.31 = 71.47 : x
  2. Step 2: Convert to fraction form
    174.21/261.31 = 71.47/x
  3. Step 3: Cross multiply
    174.21x = 261.31 × 71.47
  4. Step 4: Simplify right side
    174.21x = 18,675.83
  5. Step 5: Solve for x
    x = 18,675.83/174.21
  6. Step 6: Final answer
    x = 107.20

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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.