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Finding the Fourth Proportional to 261.12, 391.50 and 174.36

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Solution

The fourth proportional to 261.12, 391.50 and 174.36 is: 261.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.12 : 391.50 = 174.36 : x
  2. Step 2: Convert to fraction form
    261.12/391.50 = 174.36/x
  3. Step 3: Cross multiply
    261.12x = 391.50 × 174.36
  4. Step 4: Simplify right side
    261.12x = 68,261.94
  5. Step 5: Solve for x
    x = 68,261.94/261.12
  6. Step 6: Final answer
    x = 261.42

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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.