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Finding the Fourth Proportional to 285.96, 395.14 and 228.20

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Solution

The fourth proportional to 285.96, 395.14 and 228.20 is: 315.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.96 : 395.14 = 228.20 : x
  2. Step 2: Convert to fraction form
    285.96/395.14 = 228.20/x
  3. Step 3: Cross multiply
    285.96x = 395.14 × 228.20
  4. Step 4: Simplify right side
    285.96x = 90,170.95
  5. Step 5: Solve for x
    x = 90,170.95/285.96
  6. Step 6: Final answer
    x = 315.33

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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.