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Finding the Fourth Proportional to 1,209.48, 1,668.94 and 711.94

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Solution

The fourth proportional to 1,209.48, 1,668.94 and 711.94 is: 982.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.48 : 1,668.94 = 711.94 : x
  2. Step 2: Convert to fraction form
    1,209.48/1,668.94 = 711.94/x
  3. Step 3: Cross multiply
    1,209.48x = 1,668.94 × 711.94
  4. Step 4: Simplify right side
    1,209.48x = 1,188,185.14
  5. Step 5: Solve for x
    x = 1,188,185.14/1,209.48
  6. Step 6: Final answer
    x = 982.39

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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.