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Finding the Fourth Proportional to 3,999.05, 5,990.53 and 1,991.69

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Solution

The fourth proportional to 3,999.05, 5,990.53 and 1,991.69 is: 2,983.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,999.05 : 5,990.53 = 1,991.69 : x
  2. Step 2: Convert to fraction form
    3,999.05/5,990.53 = 1,991.69/x
  3. Step 3: Cross multiply
    3,999.05x = 5,990.53 × 1,991.69
  4. Step 4: Simplify right side
    3,999.05x = 11,931,248.74
  5. Step 5: Solve for x
    x = 11,931,248.74/3,999.05
  6. Step 6: Final answer
    x = 2,983.52

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1.5x scale

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.