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Finding the Fourth Proportional to 800.92, 1,105.19 and 591.21

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Solution

The fourth proportional to 800.92, 1,105.19 and 591.21 is: 815.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.92 : 1,105.19 = 591.21 : x
  2. Step 2: Convert to fraction form
    800.92/1,105.19 = 591.21/x
  3. Step 3: Cross multiply
    800.92x = 1,105.19 × 591.21
  4. Step 4: Simplify right side
    800.92x = 653,399.38
  5. Step 5: Solve for x
    x = 653,399.38/800.92
  6. Step 6: Final answer
    x = 815.81

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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.