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Finding the Fourth Proportional to 309,396.62, 426,993.45 and 173,428.40

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Solution

The fourth proportional to 309,396.62, 426,993.45 and 173,428.40 is: 239,345.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,396.62 : 426,993.45 = 173,428.40 : x
  2. Step 2: Convert to fraction form
    309,396.62/426,993.45 = 173,428.40/x
  3. Step 3: Cross multiply
    309,396.62x = 426,993.45 × 173,428.40
  4. Step 4: Simplify right side
    309,396.62x = 74,052,790,843.98
  5. Step 5: Solve for x
    x = 74,052,790,843.98/309,396.62
  6. Step 6: Final answer
    x = 239,345.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.