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Finding the Fourth Proportional to 174.19, 261.21 and 71.40

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Solution

The fourth proportional to 174.19, 261.21 and 71.40 is: 107.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.19 : 261.21 = 71.40 : x
  2. Step 2: Convert to fraction form
    174.19/261.21 = 71.40/x
  3. Step 3: Cross multiply
    174.19x = 261.21 × 71.40
  4. Step 4: Simplify right side
    174.19x = 18,651.64
  5. Step 5: Solve for x
    x = 18,651.64/174.19
  6. Step 6: Final answer
    x = 107.08

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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.