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Finding the Fourth Proportional to 326.19, 489.40 and 143.72

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Solution

The fourth proportional to 326.19, 489.40 and 143.72 is: 215.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.19 : 489.40 = 143.72 : x
  2. Step 2: Convert to fraction form
    326.19/489.40 = 143.72/x
  3. Step 3: Cross multiply
    326.19x = 489.40 × 143.72
  4. Step 4: Simplify right side
    326.19x = 70,336.57
  5. Step 5: Solve for x
    x = 70,336.57/326.19
  6. Step 6: Final answer
    x = 215.63

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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.