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Finding the Fourth Proportional to 1,209.33, 1,668.50 and 816.58

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Solution

The fourth proportional to 1,209.33, 1,668.50 and 816.58 is: 1,126.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.33 : 1,668.50 = 816.58 : x
  2. Step 2: Convert to fraction form
    1,209.33/1,668.50 = 816.58/x
  3. Step 3: Cross multiply
    1,209.33x = 1,668.50 × 816.58
  4. Step 4: Simplify right side
    1,209.33x = 1,362,464.79
  5. Step 5: Solve for x
    x = 1,362,464.79/1,209.33
  6. Step 6: Final answer
    x = 1,126.63

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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.