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Finding the Fourth Proportional to 509.18, 762.78 and 303.91

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Solution

The fourth proportional to 509.18, 762.78 and 303.91 is: 455.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.18 : 762.78 = 303.91 : x
  2. Step 2: Convert to fraction form
    509.18/762.78 = 303.91/x
  3. Step 3: Cross multiply
    509.18x = 762.78 × 303.91
  4. Step 4: Simplify right side
    509.18x = 231,814.56
  5. Step 5: Solve for x
    x = 231,814.56/509.18
  6. Step 6: Final answer
    x = 455.27

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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.