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Finding the Fourth Proportional to 339.50, 509.38 and 108.42

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Solution

The fourth proportional to 339.50, 509.38 and 108.42 is: 162.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.50 : 509.38 = 108.42 : x
  2. Step 2: Convert to fraction form
    339.50/509.38 = 108.42/x
  3. Step 3: Cross multiply
    339.50x = 509.38 × 108.42
  4. Step 4: Simplify right side
    339.50x = 55,226.71
  5. Step 5: Solve for x
    x = 55,226.71/339.50
  6. Step 6: Final answer
    x = 162.67

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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.