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Finding the Fourth Proportional to 339.40, 509.10 and 133.90

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Solution

The fourth proportional to 339.40, 509.10 and 133.90 is: 200.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.40 : 509.10 = 133.90 : x
  2. Step 2: Convert to fraction form
    339.40/509.10 = 133.90/x
  3. Step 3: Cross multiply
    339.40x = 509.10 × 133.90
  4. Step 4: Simplify right side
    339.40x = 68,168.49
  5. Step 5: Solve for x
    x = 68,168.49/339.40
  6. Step 6: Final answer
    x = 200.85

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Double scale
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Similar ratio
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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.