Home / 1,213.28-1,821.44-636.48

Finding the Fourth Proportional to 1,213.28, 1,821.44 and 636.48

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Solution

The fourth proportional to 1,213.28, 1,821.44 and 636.48 is: 955.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.28 : 1,821.44 = 636.48 : x
  2. Step 2: Convert to fraction form
    1,213.28/1,821.44 = 636.48/x
  3. Step 3: Cross multiply
    1,213.28x = 1,821.44 × 636.48
  4. Step 4: Simplify right side
    1,213.28x = 1,159,310.13
  5. Step 5: Solve for x
    x = 1,159,310.13/1,213.28
  6. Step 6: Final answer
    x = 955.52

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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.