Home / 1,247.81-1,722.20-1,208.79

Finding the Fourth Proportional to 1,247.81, 1,722.20 and 1,208.79

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Solution

The fourth proportional to 1,247.81, 1,722.20 and 1,208.79 is: 1,668.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.81 : 1,722.20 = 1,208.79 : x
  2. Step 2: Convert to fraction form
    1,247.81/1,722.20 = 1,208.79/x
  3. Step 3: Cross multiply
    1,247.81x = 1,722.20 × 1,208.79
  4. Step 4: Simplify right side
    1,247.81x = 2,081,772.09
  5. Step 5: Solve for x
    x = 2,081,772.09/1,247.81
  6. Step 6: Final answer
    x = 1,668.35

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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.