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Finding the Fourth Proportional to 1,605.68, 2,408.72 and 509.65

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Solution

The fourth proportional to 1,605.68, 2,408.72 and 509.65 is: 764.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.68 : 2,408.72 = 509.65 : x
  2. Step 2: Convert to fraction form
    1,605.68/2,408.72 = 509.65/x
  3. Step 3: Cross multiply
    1,605.68x = 2,408.72 × 509.65
  4. Step 4: Simplify right side
    1,605.68x = 1,227,604.15
  5. Step 5: Solve for x
    x = 1,227,604.15/1,605.68
  6. Step 6: Final answer
    x = 764.54

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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.