Home / 1,211.80-1,670.34-949.36

Finding the Fourth Proportional to 1,211.80, 1,670.34 and 949.36

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Solution

The fourth proportional to 1,211.80, 1,670.34 and 949.36 is: 1,308.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.80 : 1,670.34 = 949.36 : x
  2. Step 2: Convert to fraction form
    1,211.80/1,670.34 = 949.36/x
  3. Step 3: Cross multiply
    1,211.80x = 1,670.34 × 949.36
  4. Step 4: Simplify right side
    1,211.80x = 1,585,753.98
  5. Step 5: Solve for x
    x = 1,585,753.98/1,211.80
  6. Step 6: Final answer
    x = 1,308.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.