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Finding the Fourth Proportional to 806.92, 1,211.49 and 417.24

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Solution

The fourth proportional to 806.92, 1,211.49 and 417.24 is: 626.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.92 : 1,211.49 = 417.24 : x
  2. Step 2: Convert to fraction form
    806.92/1,211.49 = 417.24/x
  3. Step 3: Cross multiply
    806.92x = 1,211.49 × 417.24
  4. Step 4: Simplify right side
    806.92x = 505,482.09
  5. Step 5: Solve for x
    x = 505,482.09/806.92
  6. Step 6: Final answer
    x = 626.44

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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.