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Finding the Fourth Proportional to 326.43, 489.35 and 120.86

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Solution

The fourth proportional to 326.43, 489.35 and 120.86 is: 181.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.43 : 489.35 = 120.86 : x
  2. Step 2: Convert to fraction form
    326.43/489.35 = 120.86/x
  3. Step 3: Cross multiply
    326.43x = 489.35 × 120.86
  4. Step 4: Simplify right side
    326.43x = 59,139.79
  5. Step 5: Solve for x
    x = 59,139.79/326.43
  6. Step 6: Final answer
    x = 181.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.