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Finding the Fourth Proportional to 1,999.92, 3,000.08 and 613.24

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Solution

The fourth proportional to 1,999.92, 3,000.08 and 613.24 is: 919.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.92 : 3,000.08 = 613.24 : x
  2. Step 2: Convert to fraction form
    1,999.92/3,000.08 = 613.24/x
  3. Step 3: Cross multiply
    1,999.92x = 3,000.08 × 613.24
  4. Step 4: Simplify right side
    1,999.92x = 1,839,769.06
  5. Step 5: Solve for x
    x = 1,839,769.06/1,999.92
  6. Step 6: Final answer
    x = 919.92

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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.