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Finding the Fourth Proportional to 823.19, 1,135.15 and 636.71

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Solution

The fourth proportional to 823.19, 1,135.15 and 636.71 is: 878.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.19 : 1,135.15 = 636.71 : x
  2. Step 2: Convert to fraction form
    823.19/1,135.15 = 636.71/x
  3. Step 3: Cross multiply
    823.19x = 1,135.15 × 636.71
  4. Step 4: Simplify right side
    823.19x = 722,761.36
  5. Step 5: Solve for x
    x = 722,761.36/823.19
  6. Step 6: Final answer
    x = 878.00

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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.