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Finding the Fourth Proportional to 174.25, 261.51 and 78.09

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Solution

The fourth proportional to 174.25, 261.51 and 78.09 is: 117.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.25 : 261.51 = 78.09 : x
  2. Step 2: Convert to fraction form
    174.25/261.51 = 78.09/x
  3. Step 3: Cross multiply
    174.25x = 261.51 × 78.09
  4. Step 4: Simplify right side
    174.25x = 20,421.32
  5. Step 5: Solve for x
    x = 20,421.32/174.25
  6. Step 6: Final answer
    x = 117.20

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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.