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Finding the Fourth Proportional to 1,212.60, 1,809.99 and 1,172.04

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Solution

The fourth proportional to 1,212.60, 1,809.99 and 1,172.04 is: 1,749.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.60 : 1,809.99 = 1,172.04 : x
  2. Step 2: Convert to fraction form
    1,212.60/1,809.99 = 1,172.04/x
  3. Step 3: Cross multiply
    1,212.60x = 1,809.99 × 1,172.04
  4. Step 4: Simplify right side
    1,212.60x = 2,121,380.68
  5. Step 5: Solve for x
    x = 2,121,380.68/1,212.60
  6. Step 6: Final answer
    x = 1,749.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.