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Finding the Fourth Proportional to 339.40, 509.10 and 325.90

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Solution

The fourth proportional to 339.40, 509.10 and 325.90 is: 488.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.40 : 509.10 = 325.90 : x
  2. Step 2: Convert to fraction form
    339.40/509.10 = 325.90/x
  3. Step 3: Cross multiply
    339.40x = 509.10 × 325.90
  4. Step 4: Simplify right side
    339.40x = 165,915.69
  5. Step 5: Solve for x
    x = 165,915.69/339.40
  6. Step 6: Final answer
    x = 488.85

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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.