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Finding the Fourth Proportional to 509.21, 763.56 and 216.60

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Solution

The fourth proportional to 509.21, 763.56 and 216.60 is: 324.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.21 : 763.56 = 216.60 : x
  2. Step 2: Convert to fraction form
    509.21/763.56 = 216.60/x
  3. Step 3: Cross multiply
    509.21x = 763.56 × 216.60
  4. Step 4: Simplify right side
    509.21x = 165,387.10
  5. Step 5: Solve for x
    x = 165,387.10/509.21
  6. Step 6: Final answer
    x = 324.79

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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.