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Finding the Fourth Proportional to 820.98, 1,131.84 and 644.13

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Solution

The fourth proportional to 820.98, 1,131.84 and 644.13 is: 888.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.98 : 1,131.84 = 644.13 : x
  2. Step 2: Convert to fraction form
    820.98/1,131.84 = 644.13/x
  3. Step 3: Cross multiply
    820.98x = 1,131.84 × 644.13
  4. Step 4: Simplify right side
    820.98x = 729,052.10
  5. Step 5: Solve for x
    x = 729,052.10/820.98
  6. Step 6: Final answer
    x = 888.03

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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.