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Finding the Fourth Proportional to 354.74, 489.57 and 228.78

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Solution

The fourth proportional to 354.74, 489.57 and 228.78 is: 315.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.74 : 489.57 = 228.78 : x
  2. Step 2: Convert to fraction form
    354.74/489.57 = 228.78/x
  3. Step 3: Cross multiply
    354.74x = 489.57 × 228.78
  4. Step 4: Simplify right side
    354.74x = 112,003.82
  5. Step 5: Solve for x
    x = 112,003.82/354.74
  6. Step 6: Final answer
    x = 315.74

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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.