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Finding the Fourth Proportional to 239.28, 357 and 228.42

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Solution

The fourth proportional to 239.28, 357 and 228.42 is: 340.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.28 : 357 = 228.42 : x
  2. Step 2: Convert to fraction form
    239.28/357 = 228.42/x
  3. Step 3: Cross multiply
    239.28x = 357 × 228.42
  4. Step 4: Simplify right side
    239.28x = 81,545.94
  5. Step 5: Solve for x
    x = 81,545.94/239.28
  6. Step 6: Final answer
    x = 340.80

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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.