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Finding the Fourth Proportional to 328,578.82, 492,868.38 and 138,990.04

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Solution

The fourth proportional to 328,578.82, 492,868.38 and 138,990.04 is: 208,485.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,578.82 : 492,868.38 = 138,990.04 : x
  2. Step 2: Convert to fraction form
    328,578.82/492,868.38 = 138,990.04/x
  3. Step 3: Cross multiply
    328,578.82x = 492,868.38 × 138,990.04
  4. Step 4: Simplify right side
    328,578.82x = 68,503,795,850.94
  5. Step 5: Solve for x
    x = 68,503,795,850.94/328,578.82
  6. Step 6: Final answer
    x = 208,485.12

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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.