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Finding the Fourth Proportional to 351,786.40, 528,068.40 and 218,816.80

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Solution

The fourth proportional to 351,786.40, 528,068.40 and 218,816.80 is: 328,467.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,786.40 : 528,068.40 = 218,816.80 : x
  2. Step 2: Convert to fraction form
    351,786.40/528,068.40 = 218,816.80/x
  3. Step 3: Cross multiply
    351,786.40x = 528,068.40 × 218,816.80
  4. Step 4: Simplify right side
    351,786.40x = 115,550,237,469.12
  5. Step 5: Solve for x
    x = 115,550,237,469.12/351,786.40
  6. Step 6: Final answer
    x = 328,467.04

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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.