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Finding the Fourth Proportional to 820.26, 1,131.77 and 488.79

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Solution

The fourth proportional to 820.26, 1,131.77 and 488.79 is: 674.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.26 : 1,131.77 = 488.79 : x
  2. Step 2: Convert to fraction form
    820.26/1,131.77 = 488.79/x
  3. Step 3: Cross multiply
    820.26x = 1,131.77 × 488.79
  4. Step 4: Simplify right side
    820.26x = 553,195.41
  5. Step 5: Solve for x
    x = 553,195.41/820.26
  6. Step 6: Final answer
    x = 674.41

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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.