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Finding the Fourth Proportional to 174.80, 261.84 and 142.40

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Solution

The fourth proportional to 174.80, 261.84 and 142.40 is: 213.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.80 : 261.84 = 142.40 : x
  2. Step 2: Convert to fraction form
    174.80/261.84 = 142.40/x
  3. Step 3: Cross multiply
    174.80x = 261.84 × 142.40
  4. Step 4: Simplify right side
    174.80x = 37,286.02
  5. Step 5: Solve for x
    x = 37,286.02/174.80
  6. Step 6: Final answer
    x = 213.31

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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.