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Finding the Fourth Proportional to 1,209.30, 1,668.90 and 914.04

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Solution

The fourth proportional to 1,209.30, 1,668.90 and 914.04 is: 1,261.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.30 : 1,668.90 = 914.04 : x
  2. Step 2: Convert to fraction form
    1,209.30/1,668.90 = 914.04/x
  3. Step 3: Cross multiply
    1,209.30x = 1,668.90 × 914.04
  4. Step 4: Simplify right side
    1,209.30x = 1,525,441.36
  5. Step 5: Solve for x
    x = 1,525,441.36/1,209.30
  6. Step 6: Final answer
    x = 1,261.43

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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.