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Finding the Fourth Proportional to 339.55, 509.42 and 108.43

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Solution

The fourth proportional to 339.55, 509.42 and 108.43 is: 162.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.55 : 509.42 = 108.43 : x
  2. Step 2: Convert to fraction form
    339.55/509.42 = 108.43/x
  3. Step 3: Cross multiply
    339.55x = 509.42 × 108.43
  4. Step 4: Simplify right side
    339.55x = 55,236.41
  5. Step 5: Solve for x
    x = 55,236.41/339.55
  6. Step 6: Final answer
    x = 162.68

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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.