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Finding the Fourth Proportional to 806.39, 1,111.31 and 629.07

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Solution

The fourth proportional to 806.39, 1,111.31 and 629.07 is: 866.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.39 : 1,111.31 = 629.07 : x
  2. Step 2: Convert to fraction form
    806.39/1,111.31 = 629.07/x
  3. Step 3: Cross multiply
    806.39x = 1,111.31 × 629.07
  4. Step 4: Simplify right side
    806.39x = 699,088.64
  5. Step 5: Solve for x
    x = 699,088.64/806.39
  6. Step 6: Final answer
    x = 866.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.