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Finding the Fourth Proportional to 339.82, 509.94 and 147.45

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Solution

The fourth proportional to 339.82, 509.94 and 147.45 is: 221.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.82 : 509.94 = 147.45 : x
  2. Step 2: Convert to fraction form
    339.82/509.94 = 147.45/x
  3. Step 3: Cross multiply
    339.82x = 509.94 × 147.45
  4. Step 4: Simplify right side
    339.82x = 75,187.85
  5. Step 5: Solve for x
    x = 75,187.85/339.82
  6. Step 6: Final answer
    x = 221.26

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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.