Home / 1,209.70-1,670.67-949.69

Finding the Fourth Proportional to 1,209.70, 1,670.67 and 949.69

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Solution

The fourth proportional to 1,209.70, 1,670.67 and 949.69 is: 1,311.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.70 : 1,670.67 = 949.69 : x
  2. Step 2: Convert to fraction form
    1,209.70/1,670.67 = 949.69/x
  3. Step 3: Cross multiply
    1,209.70x = 1,670.67 × 949.69
  4. Step 4: Simplify right side
    1,209.70x = 1,586,618.59
  5. Step 5: Solve for x
    x = 1,586,618.59/1,209.70
  6. Step 6: Final answer
    x = 1,311.58

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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.