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Finding the Fourth Proportional to 2,990.02, 4,478.54 and 1,891.66

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Solution

The fourth proportional to 2,990.02, 4,478.54 and 1,891.66 is: 2,833.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.02 : 4,478.54 = 1,891.66 : x
  2. Step 2: Convert to fraction form
    2,990.02/4,478.54 = 1,891.66/x
  3. Step 3: Cross multiply
    2,990.02x = 4,478.54 × 1,891.66
  4. Step 4: Simplify right side
    2,990.02x = 8,471,874.98
  5. Step 5: Solve for x
    x = 8,471,874.98/2,990.02
  6. Step 6: Final answer
    x = 2,833.38

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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.