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Finding the Fourth Proportional to 2,990.90, 4,486.58 and 911.09

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Solution

The fourth proportional to 2,990.90, 4,486.58 and 911.09 is: 1,366.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.90 : 4,486.58 = 911.09 : x
  2. Step 2: Convert to fraction form
    2,990.90/4,486.58 = 911.09/x
  3. Step 3: Cross multiply
    2,990.90x = 4,486.58 × 911.09
  4. Step 4: Simplify right side
    2,990.90x = 4,087,651.18
  5. Step 5: Solve for x
    x = 4,087,651.18/2,990.90
  6. Step 6: Final answer
    x = 1,366.69

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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.