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Finding the Fourth Proportional to 1,485.70, 2,229.32 and 663.80

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Solution

The fourth proportional to 1,485.70, 2,229.32 and 663.80 is: 996.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.70 : 2,229.32 = 663.80 : x
  2. Step 2: Convert to fraction form
    1,485.70/2,229.32 = 663.80/x
  3. Step 3: Cross multiply
    1,485.70x = 2,229.32 × 663.80
  4. Step 4: Simplify right side
    1,485.70x = 1,479,813.13
  5. Step 5: Solve for x
    x = 1,479,813.13/1,485.70
  6. Step 6: Final answer
    x = 996.04

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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.