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Finding the Fourth Proportional to 326.07, 489.29 and 143.64

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Solution

The fourth proportional to 326.07, 489.29 and 143.64 is: 215.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.07 : 489.29 = 143.64 : x
  2. Step 2: Convert to fraction form
    326.07/489.29 = 143.64/x
  3. Step 3: Cross multiply
    326.07x = 489.29 × 143.64
  4. Step 4: Simplify right side
    326.07x = 70,280.90
  5. Step 5: Solve for x
    x = 70,280.90/326.07
  6. Step 6: Final answer
    x = 215.54

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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.