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Finding the Fourth Proportional to 1,208.69, 1,668.20 and 1,012.13

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Solution

The fourth proportional to 1,208.69, 1,668.20 and 1,012.13 is: 1,396.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.69 : 1,668.20 = 1,012.13 : x
  2. Step 2: Convert to fraction form
    1,208.69/1,668.20 = 1,012.13/x
  3. Step 3: Cross multiply
    1,208.69x = 1,668.20 × 1,012.13
  4. Step 4: Simplify right side
    1,208.69x = 1,688,435.27
  5. Step 5: Solve for x
    x = 1,688,435.27/1,208.69
  6. Step 6: Final answer
    x = 1,396.91

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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.