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Finding the Fourth Proportional to 645,578.94, 890,863.59 and 355,185.03

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Solution

The fourth proportional to 645,578.94, 890,863.59 and 355,185.03 is: 490,135.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,578.94 : 890,863.59 = 355,185.03 : x
  2. Step 2: Convert to fraction form
    645,578.94/890,863.59 = 355,185.03/x
  3. Step 3: Cross multiply
    645,578.94x = 890,863.59 × 355,185.03
  4. Step 4: Simplify right side
    645,578.94x = 316,421,410,940.06
  5. Step 5: Solve for x
    x = 316,421,410,940.06/645,578.94
  6. Step 6: Final answer
    x = 490,135.89

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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.