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Finding the Fourth Proportional to 823.65, 1,137.05 and 636.72

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Solution

The fourth proportional to 823.65, 1,137.05 and 636.72 is: 878.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.65 : 1,137.05 = 636.72 : x
  2. Step 2: Convert to fraction form
    823.65/1,137.05 = 636.72/x
  3. Step 3: Cross multiply
    823.65x = 1,137.05 × 636.72
  4. Step 4: Simplify right side
    823.65x = 723,973.61
  5. Step 5: Solve for x
    x = 723,973.61/823.65
  6. Step 6: Final answer
    x = 878.99

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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.