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Finding the Fourth Proportional to 1,999.81, 3,000.06 and 613.12

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Solution

The fourth proportional to 1,999.81, 3,000.06 and 613.12 is: 919.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.81 : 3,000.06 = 613.12 : x
  2. Step 2: Convert to fraction form
    1,999.81/3,000.06 = 613.12/x
  3. Step 3: Cross multiply
    1,999.81x = 3,000.06 × 613.12
  4. Step 4: Simplify right side
    1,999.81x = 1,839,396.79
  5. Step 5: Solve for x
    x = 1,839,396.79/1,999.81
  6. Step 6: Final answer
    x = 919.79

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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.