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Finding the Fourth Proportional to 354.86, 489.70 and 199.61

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Solution

The fourth proportional to 354.86, 489.70 and 199.61 is: 275.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.86 : 489.70 = 199.61 : x
  2. Step 2: Convert to fraction form
    354.86/489.70 = 199.61/x
  3. Step 3: Cross multiply
    354.86x = 489.70 × 199.61
  4. Step 4: Simplify right side
    354.86x = 97,745.57
  5. Step 5: Solve for x
    x = 97,745.57/354.86
  6. Step 6: Final answer
    x = 275.45

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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.