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Finding the Fourth Proportional to 806.87, 1,112.85 and 492.18

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Solution

The fourth proportional to 806.87, 1,112.85 and 492.18 is: 678.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.87 : 1,112.85 = 492.18 : x
  2. Step 2: Convert to fraction form
    806.87/1,112.85 = 492.18/x
  3. Step 3: Cross multiply
    806.87x = 1,112.85 × 492.18
  4. Step 4: Simplify right side
    806.87x = 547,722.51
  5. Step 5: Solve for x
    x = 547,722.51/806.87
  6. Step 6: Final answer
    x = 678.83

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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.