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Finding the Fourth Proportional to 1,490.99, 2,236.21 and 669.29

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Solution

The fourth proportional to 1,490.99, 2,236.21 and 669.29 is: 1,003.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.99 : 2,236.21 = 669.29 : x
  2. Step 2: Convert to fraction form
    1,490.99/2,236.21 = 669.29/x
  3. Step 3: Cross multiply
    1,490.99x = 2,236.21 × 669.29
  4. Step 4: Simplify right side
    1,490.99x = 1,496,660.14
  5. Step 5: Solve for x
    x = 1,496,660.14/1,490.99
  6. Step 6: Final answer
    x = 1,003.81

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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.