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Finding the Fourth Proportional to 806.87, 1,208.91 and 634.64

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Solution

The fourth proportional to 806.87, 1,208.91 and 634.64 is: 950.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.87 : 1,208.91 = 634.64 : x
  2. Step 2: Convert to fraction form
    806.87/1,208.91 = 634.64/x
  3. Step 3: Cross multiply
    806.87x = 1,208.91 × 634.64
  4. Step 4: Simplify right side
    806.87x = 767,222.64
  5. Step 5: Solve for x
    x = 767,222.64/806.87
  6. Step 6: Final answer
    x = 950.86

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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.