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Finding the Fourth Proportional to 726, 1,089.20 and 213

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Solution

The fourth proportional to 726, 1,089.20 and 213 is: 319.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    726 : 1,089.20 = 213 : x
  2. Step 2: Convert to fraction form
    726/1,089.20 = 213/x
  3. Step 3: Cross multiply
    726x = 1,089.20 × 213
  4. Step 4: Simplify right side
    726x = 231,999.60
  5. Step 5: Solve for x
    x = 231,999.60/726
  6. Step 6: Final answer
    x = 319.56

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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.