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Finding the Fourth Proportional to 2,990.21, 4,485.33 and 910.22

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Solution

The fourth proportional to 2,990.21, 4,485.33 and 910.22 is: 1,365.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.21 : 4,485.33 = 910.22 : x
  2. Step 2: Convert to fraction form
    2,990.21/4,485.33 = 910.22/x
  3. Step 3: Cross multiply
    2,990.21x = 4,485.33 × 910.22
  4. Step 4: Simplify right side
    2,990.21x = 4,082,614.65
  5. Step 5: Solve for x
    x = 4,082,614.65/2,990.21
  6. Step 6: Final answer
    x = 1,365.33

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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.