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Finding the Fourth Proportional to 318.55, 439.61 and 178.69

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Solution

The fourth proportional to 318.55, 439.61 and 178.69 is: 246.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.55 : 439.61 = 178.69 : x
  2. Step 2: Convert to fraction form
    318.55/439.61 = 178.69/x
  3. Step 3: Cross multiply
    318.55x = 439.61 × 178.69
  4. Step 4: Simplify right side
    318.55x = 78,554.40
  5. Step 5: Solve for x
    x = 78,554.40/318.55
  6. Step 6: Final answer
    x = 246.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.