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Finding the Fourth Proportional to 339.38, 509.07 and 82.88

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Solution

The fourth proportional to 339.38, 509.07 and 82.88 is: 124.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.38 : 509.07 = 82.88 : x
  2. Step 2: Convert to fraction form
    339.38/509.07 = 82.88/x
  3. Step 3: Cross multiply
    339.38x = 509.07 × 82.88
  4. Step 4: Simplify right side
    339.38x = 42,191.72
  5. Step 5: Solve for x
    x = 42,191.72/339.38
  6. Step 6: Final answer
    x = 124.32

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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.