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Finding the Fourth Proportional to 509.88, 764.34 and 221.08

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Solution

The fourth proportional to 509.88, 764.34 and 221.08 is: 331.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.88 : 764.34 = 221.08 : x
  2. Step 2: Convert to fraction form
    509.88/764.34 = 221.08/x
  3. Step 3: Cross multiply
    509.88x = 764.34 × 221.08
  4. Step 4: Simplify right side
    509.88x = 168,980.29
  5. Step 5: Solve for x
    x = 168,980.29/509.88
  6. Step 6: Final answer
    x = 331.41

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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.