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Finding the Fourth Proportional to 339.66, 509.39 and 209.64

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Solution

The fourth proportional to 339.66, 509.39 and 209.64 is: 314.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.66 : 509.39 = 209.64 : x
  2. Step 2: Convert to fraction form
    339.66/509.39 = 209.64/x
  3. Step 3: Cross multiply
    339.66x = 509.39 × 209.64
  4. Step 4: Simplify right side
    339.66x = 106,787.47
  5. Step 5: Solve for x
    x = 106,787.47/339.66
  6. Step 6: Final answer
    x = 314.40

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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.