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Finding the Fourth Proportional to 994.84, 1,371.42 and 891.16

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Solution

The fourth proportional to 994.84, 1,371.42 and 891.16 is: 1,228.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.84 : 1,371.42 = 891.16 : x
  2. Step 2: Convert to fraction form
    994.84/1,371.42 = 891.16/x
  3. Step 3: Cross multiply
    994.84x = 1,371.42 × 891.16
  4. Step 4: Simplify right side
    994.84x = 1,222,154.65
  5. Step 5: Solve for x
    x = 1,222,154.65/994.84
  6. Step 6: Final answer
    x = 1,228.49

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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.