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Finding the Fourth Proportional to 326.90, 490.20 and 144.20

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Solution

The fourth proportional to 326.90, 490.20 and 144.20 is: 216.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.90 : 490.20 = 144.20 : x
  2. Step 2: Convert to fraction form
    326.90/490.20 = 144.20/x
  3. Step 3: Cross multiply
    326.90x = 490.20 × 144.20
  4. Step 4: Simplify right side
    326.90x = 70,686.84
  5. Step 5: Solve for x
    x = 70,686.84/326.90
  6. Step 6: Final answer
    x = 216.23

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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.