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Finding the Fourth Proportional to 806.56, 1,209.42 and 513.90

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Solution

The fourth proportional to 806.56, 1,209.42 and 513.90 is: 770.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.56 : 1,209.42 = 513.90 : x
  2. Step 2: Convert to fraction form
    806.56/1,209.42 = 513.90/x
  3. Step 3: Cross multiply
    806.56x = 1,209.42 × 513.90
  4. Step 4: Simplify right side
    806.56x = 621,520.94
  5. Step 5: Solve for x
    x = 621,520.94/806.56
  6. Step 6: Final answer
    x = 770.58

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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.