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Finding the Fourth Proportional to 806.92, 1,112.90 and 558.18

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Solution

The fourth proportional to 806.92, 1,112.90 and 558.18 is: 769.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.92 : 1,112.90 = 558.18 : x
  2. Step 2: Convert to fraction form
    806.92/1,112.90 = 558.18/x
  3. Step 3: Cross multiply
    806.92x = 1,112.90 × 558.18
  4. Step 4: Simplify right side
    806.92x = 621,195.73
  5. Step 5: Solve for x
    x = 621,195.73/806.92
  6. Step 6: Final answer
    x = 769.84

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Double scale
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1.5x scale

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.