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Finding the Fourth Proportional to 239.49, 357.28 and 228.15

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Solution

The fourth proportional to 239.49, 357.28 and 228.15 is: 340.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.49 : 357.28 = 228.15 : x
  2. Step 2: Convert to fraction form
    239.49/357.28 = 228.15/x
  3. Step 3: Cross multiply
    239.49x = 357.28 × 228.15
  4. Step 4: Simplify right side
    239.49x = 81,513.43
  5. Step 5: Solve for x
    x = 81,513.43/239.49
  6. Step 6: Final answer
    x = 340.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.