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Finding the Fourth Proportional to 1,999.89, 2,999.88 and 613.26

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Solution

The fourth proportional to 1,999.89, 2,999.88 and 613.26 is: 919.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.89 : 2,999.88 = 613.26 : x
  2. Step 2: Convert to fraction form
    1,999.89/2,999.88 = 613.26/x
  3. Step 3: Cross multiply
    1,999.89x = 2,999.88 × 613.26
  4. Step 4: Simplify right side
    1,999.89x = 1,839,706.41
  5. Step 5: Solve for x
    x = 1,839,706.41/1,999.89
  6. Step 6: Final answer
    x = 919.90

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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.