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Finding the Fourth Proportional to 1,205.93, 1,809.09 and 426.17

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Solution

The fourth proportional to 1,205.93, 1,809.09 and 426.17 is: 639.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.93 : 1,809.09 = 426.17 : x
  2. Step 2: Convert to fraction form
    1,205.93/1,809.09 = 426.17/x
  3. Step 3: Cross multiply
    1,205.93x = 1,809.09 × 426.17
  4. Step 4: Simplify right side
    1,205.93x = 770,970.84
  5. Step 5: Solve for x
    x = 770,970.84/1,205.93
  6. Step 6: Final answer
    x = 639.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.