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Finding the Fourth Proportional to 1,209.53, 1,669.09 and 678.37

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Solution

The fourth proportional to 1,209.53, 1,669.09 and 678.37 is: 936.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.53 : 1,669.09 = 678.37 : x
  2. Step 2: Convert to fraction form
    1,209.53/1,669.09 = 678.37/x
  3. Step 3: Cross multiply
    1,209.53x = 1,669.09 × 678.37
  4. Step 4: Simplify right side
    1,209.53x = 1,132,260.58
  5. Step 5: Solve for x
    x = 1,132,260.58/1,209.53
  6. Step 6: Final answer
    x = 936.12

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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.