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Finding the Fourth Proportional to 426,198.30, 639,643.05 and 412,374.30

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Solution

The fourth proportional to 426,198.30, 639,643.05 and 412,374.30 is: 618,895.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,198.30 : 639,643.05 = 412,374.30 : x
  2. Step 2: Convert to fraction form
    426,198.30/639,643.05 = 412,374.30/x
  3. Step 3: Cross multiply
    426,198.30x = 639,643.05 × 412,374.30
  4. Step 4: Simplify right side
    426,198.30x = 263,772,354,993.62
  5. Step 5: Solve for x
    x = 263,772,354,993.62/426,198.30
  6. Step 6: Final answer
    x = 618,895.84

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1.5x scale

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.