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Finding the Fourth Proportional to 354.69, 489.53 and 281.57

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Solution

The fourth proportional to 354.69, 489.53 and 281.57 is: 388.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.69 : 489.53 = 281.57 : x
  2. Step 2: Convert to fraction form
    354.69/489.53 = 281.57/x
  3. Step 3: Cross multiply
    354.69x = 489.53 × 281.57
  4. Step 4: Simplify right side
    354.69x = 137,835.22
  5. Step 5: Solve for x
    x = 137,835.22/354.69
  6. Step 6: Final answer
    x = 388.61

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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.