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Finding the Fourth Proportional to 994.78, 1,489.06 and 890.44

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Solution

The fourth proportional to 994.78, 1,489.06 and 890.44 is: 1,332.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.78 : 1,489.06 = 890.44 : x
  2. Step 2: Convert to fraction form
    994.78/1,489.06 = 890.44/x
  3. Step 3: Cross multiply
    994.78x = 1,489.06 × 890.44
  4. Step 4: Simplify right side
    994.78x = 1,325,918.59
  5. Step 5: Solve for x
    x = 1,325,918.59/994.78
  6. Step 6: Final answer
    x = 1,332.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.