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Finding the Fourth Proportional to 1,486.15, 2,229.50 and 664.45

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Solution

The fourth proportional to 1,486.15, 2,229.50 and 664.45 is: 996.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.15 : 2,229.50 = 664.45 : x
  2. Step 2: Convert to fraction form
    1,486.15/2,229.50 = 664.45/x
  3. Step 3: Cross multiply
    1,486.15x = 2,229.50 × 664.45
  4. Step 4: Simplify right side
    1,486.15x = 1,481,387.95
  5. Step 5: Solve for x
    x = 1,481,387.95/1,486.15
  6. Step 6: Final answer
    x = 996.80

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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.