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Finding the Fourth Proportional to 800.93, 1,105.43 and 636.40

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Solution

The fourth proportional to 800.93, 1,105.43 and 636.40 is: 878.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.93 : 1,105.43 = 636.40 : x
  2. Step 2: Convert to fraction form
    800.93/1,105.43 = 636.40/x
  3. Step 3: Cross multiply
    800.93x = 1,105.43 × 636.40
  4. Step 4: Simplify right side
    800.93x = 703,495.65
  5. Step 5: Solve for x
    x = 703,495.65/800.93
  6. Step 6: Final answer
    x = 878.35

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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.