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Finding the Fourth Proportional to 351,790.90, 528,075.15 and 218,821.30

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Solution

The fourth proportional to 351,790.90, 528,075.15 and 218,821.30 is: 328,473.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,790.90 : 528,075.15 = 218,821.30 : x
  2. Step 2: Convert to fraction form
    351,790.90/528,075.15 = 218,821.30/x
  3. Step 3: Cross multiply
    351,790.90x = 528,075.15 × 218,821.30
  4. Step 4: Simplify right side
    351,790.90x = 115,554,090,820.70
  5. Step 5: Solve for x
    x = 115,554,090,820.70/351,790.90
  6. Step 6: Final answer
    x = 328,473.79

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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.