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Finding the Fourth Proportional to 339.28, 509.32 and 203.20

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Solution

The fourth proportional to 339.28, 509.32 and 203.20 is: 305.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.28 : 509.32 = 203.20 : x
  2. Step 2: Convert to fraction form
    339.28/509.32 = 203.20/x
  3. Step 3: Cross multiply
    339.28x = 509.32 × 203.20
  4. Step 4: Simplify right side
    339.28x = 103,493.82
  5. Step 5: Solve for x
    x = 103,493.82/339.28
  6. Step 6: Final answer
    x = 305.04

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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.