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Finding the Fourth Proportional to 806.22, 1,112.81 and 511.38

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Solution

The fourth proportional to 806.22, 1,112.81 and 511.38 is: 705.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.22 : 1,112.81 = 511.38 : x
  2. Step 2: Convert to fraction form
    806.22/1,112.81 = 511.38/x
  3. Step 3: Cross multiply
    806.22x = 1,112.81 × 511.38
  4. Step 4: Simplify right side
    806.22x = 569,066.22
  5. Step 5: Solve for x
    x = 569,066.22/806.22
  6. Step 6: Final answer
    x = 705.84

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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.