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Finding the Fourth Proportional to 509.32, 764.16 and 217

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Solution

The fourth proportional to 509.32, 764.16 and 217 is: 325.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.32 : 764.16 = 217 : x
  2. Step 2: Convert to fraction form
    509.32/764.16 = 217/x
  3. Step 3: Cross multiply
    509.32x = 764.16 × 217
  4. Step 4: Simplify right side
    509.32x = 165,822.72
  5. Step 5: Solve for x
    x = 165,822.72/509.32
  6. Step 6: Final answer
    x = 325.58

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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.