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Finding the Fourth Proportional to 509.67, 764.55 and 394.20

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Solution

The fourth proportional to 509.67, 764.55 and 394.20 is: 591.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.67 : 764.55 = 394.20 : x
  2. Step 2: Convert to fraction form
    509.67/764.55 = 394.20/x
  3. Step 3: Cross multiply
    509.67x = 764.55 × 394.20
  4. Step 4: Simplify right side
    509.67x = 301,385.61
  5. Step 5: Solve for x
    x = 301,385.61/509.67
  6. Step 6: Final answer
    x = 591.33

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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.