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Finding the Fourth Proportional to 805.92, 1,208.32 and 513.64

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Solution

The fourth proportional to 805.92, 1,208.32 and 513.64 is: 770.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.92 : 1,208.32 = 513.64 : x
  2. Step 2: Convert to fraction form
    805.92/1,208.32 = 513.64/x
  3. Step 3: Cross multiply
    805.92x = 1,208.32 × 513.64
  4. Step 4: Simplify right side
    805.92x = 620,641.48
  5. Step 5: Solve for x
    x = 620,641.48/805.92
  6. Step 6: Final answer
    x = 770.10

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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.