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Finding the Fourth Proportional to 339.21, 507.79 and 217.30

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Solution

The fourth proportional to 339.21, 507.79 and 217.30 is: 325.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.21 : 507.79 = 217.30 : x
  2. Step 2: Convert to fraction form
    339.21/507.79 = 217.30/x
  3. Step 3: Cross multiply
    339.21x = 507.79 × 217.30
  4. Step 4: Simplify right side
    339.21x = 110,342.77
  5. Step 5: Solve for x
    x = 110,342.77/339.21
  6. Step 6: Final answer
    x = 325.29

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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.