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Finding the Fourth Proportional to 1,208.85, 1,668.50 and 711.80

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Solution

The fourth proportional to 1,208.85, 1,668.50 and 711.80 is: 982.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.85 : 1,668.50 = 711.80 : x
  2. Step 2: Convert to fraction form
    1,208.85/1,668.50 = 711.80/x
  3. Step 3: Cross multiply
    1,208.85x = 1,668.50 × 711.80
  4. Step 4: Simplify right side
    1,208.85x = 1,187,638.30
  5. Step 5: Solve for x
    x = 1,187,638.30/1,208.85
  6. Step 6: Final answer
    x = 982.45

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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.