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Finding the Fourth Proportional to 326.10, 489.26 and 143.47

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Solution

The fourth proportional to 326.10, 489.26 and 143.47 is: 215.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.10 : 489.26 = 143.47 : x
  2. Step 2: Convert to fraction form
    326.10/489.26 = 143.47/x
  3. Step 3: Cross multiply
    326.10x = 489.26 × 143.47
  4. Step 4: Simplify right side
    326.10x = 70,193.27
  5. Step 5: Solve for x
    x = 70,193.27/326.10
  6. Step 6: Final answer
    x = 215.25

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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.