Home / 1,211.49-1,817.75-518.31

Finding the Fourth Proportional to 1,211.49, 1,817.75 and 518.31

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Solution

The fourth proportional to 1,211.49, 1,817.75 and 518.31 is: 777.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.49 : 1,817.75 = 518.31 : x
  2. Step 2: Convert to fraction form
    1,211.49/1,817.75 = 518.31/x
  3. Step 3: Cross multiply
    1,211.49x = 1,817.75 × 518.31
  4. Step 4: Simplify right side
    1,211.49x = 942,159.30
  5. Step 5: Solve for x
    x = 942,159.30/1,211.49
  6. Step 6: Final answer
    x = 777.69

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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.