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Finding the Fourth Proportional to 1,998.90, 2,998.28 and 612.18

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Solution

The fourth proportional to 1,998.90, 2,998.28 and 612.18 is: 918.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.90 : 2,998.28 = 612.18 : x
  2. Step 2: Convert to fraction form
    1,998.90/2,998.28 = 612.18/x
  3. Step 3: Cross multiply
    1,998.90x = 2,998.28 × 612.18
  4. Step 4: Simplify right side
    1,998.90x = 1,835,487.05
  5. Step 5: Solve for x
    x = 1,835,487.05/1,998.90
  6. Step 6: Final answer
    x = 918.25

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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.