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Finding the Fourth Proportional to 403,938.80, 605,908.20 and 123,455.60

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Solution

The fourth proportional to 403,938.80, 605,908.20 and 123,455.60 is: 185,183.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,938.80 : 605,908.20 = 123,455.60 : x
  2. Step 2: Convert to fraction form
    403,938.80/605,908.20 = 123,455.60/x
  3. Step 3: Cross multiply
    403,938.80x = 605,908.20 × 123,455.60
  4. Step 4: Simplify right side
    403,938.80x = 74,802,760,375.92
  5. Step 5: Solve for x
    x = 74,802,760,375.92/403,938.80
  6. Step 6: Final answer
    x = 185,183.40

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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.