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Finding the Fourth Proportional to 245.90, 339.42 and 239.30

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Solution

The fourth proportional to 245.90, 339.42 and 239.30 is: 330.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.90 : 339.42 = 239.30 : x
  2. Step 2: Convert to fraction form
    245.90/339.42 = 239.30/x
  3. Step 3: Cross multiply
    245.90x = 339.42 × 239.30
  4. Step 4: Simplify right side
    245.90x = 81,223.21
  5. Step 5: Solve for x
    x = 81,223.21/245.90
  6. Step 6: Final answer
    x = 330.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.