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Finding the Fourth Proportional to 994.51, 1,479.25 and 991.18

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Solution

The fourth proportional to 994.51, 1,479.25 and 991.18 is: 1,474.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.51 : 1,479.25 = 991.18 : x
  2. Step 2: Convert to fraction form
    994.51/1,479.25 = 991.18/x
  3. Step 3: Cross multiply
    994.51x = 1,479.25 × 991.18
  4. Step 4: Simplify right side
    994.51x = 1,466,198.06
  5. Step 5: Solve for x
    x = 1,466,198.06/994.51
  6. Step 6: Final answer
    x = 1,474.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.