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Finding the Fourth Proportional to 994.89, 1,373.18 and 644.97

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Solution

The fourth proportional to 994.89, 1,373.18 and 644.97 is: 890.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.89 : 1,373.18 = 644.97 : x
  2. Step 2: Convert to fraction form
    994.89/1,373.18 = 644.97/x
  3. Step 3: Cross multiply
    994.89x = 1,373.18 × 644.97
  4. Step 4: Simplify right side
    994.89x = 885,659.90
  5. Step 5: Solve for x
    x = 885,659.90/994.89
  6. Step 6: Final answer
    x = 890.21

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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.