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Finding the Fourth Proportional to 509.58, 764.27 and 221.07

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Solution

The fourth proportional to 509.58, 764.27 and 221.07 is: 331.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.58 : 764.27 = 221.07 : x
  2. Step 2: Convert to fraction form
    509.58/764.27 = 221.07/x
  3. Step 3: Cross multiply
    509.58x = 764.27 × 221.07
  4. Step 4: Simplify right side
    509.58x = 168,956.06
  5. Step 5: Solve for x
    x = 168,956.06/509.58
  6. Step 6: Final answer
    x = 331.56

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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.