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Finding the Fourth Proportional to 412,272.80, 618,409.20 and 318,845.60

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Solution

The fourth proportional to 412,272.80, 618,409.20 and 318,845.60 is: 478,268.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    412,272.80 : 618,409.20 = 318,845.60 : x
  2. Step 2: Convert to fraction form
    412,272.80/618,409.20 = 318,845.60/x
  3. Step 3: Cross multiply
    412,272.80x = 618,409.20 × 318,845.60
  4. Step 4: Simplify right side
    412,272.80x = 197,177,052,419.52
  5. Step 5: Solve for x
    x = 197,177,052,419.52/412,272.80
  6. Step 6: Final answer
    x = 478,268.40

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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.