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Finding the Fourth Proportional to 1,213.95, 1,821.46 and 636.69

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Solution

The fourth proportional to 1,213.95, 1,821.46 and 636.69 is: 955.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.95 : 1,821.46 = 636.69 : x
  2. Step 2: Convert to fraction form
    1,213.95/1,821.46 = 636.69/x
  3. Step 3: Cross multiply
    1,213.95x = 1,821.46 × 636.69
  4. Step 4: Simplify right side
    1,213.95x = 1,159,705.37
  5. Step 5: Solve for x
    x = 1,159,705.37/1,213.95
  6. Step 6: Final answer
    x = 955.32

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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.