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Finding the Fourth Proportional to 174.78, 261.93 and 78.39

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Solution

The fourth proportional to 174.78, 261.93 and 78.39 is: 117.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.78 : 261.93 = 78.39 : x
  2. Step 2: Convert to fraction form
    174.78/261.93 = 78.39/x
  3. Step 3: Cross multiply
    174.78x = 261.93 × 78.39
  4. Step 4: Simplify right side
    174.78x = 20,532.69
  5. Step 5: Solve for x
    x = 20,532.69/174.78
  6. Step 6: Final answer
    x = 117.48

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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.