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Finding the Fourth Proportional to 398,992.67, 550,812.96 and 308,144.69

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Solution

The fourth proportional to 398,992.67, 550,812.96 and 308,144.69 is: 425,396.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,992.67 : 550,812.96 = 308,144.69 : x
  2. Step 2: Convert to fraction form
    398,992.67/550,812.96 = 308,144.69/x
  3. Step 3: Cross multiply
    398,992.67x = 550,812.96 × 308,144.69
  4. Step 4: Simplify right side
    398,992.67x = 169,730,088,118.67
  5. Step 5: Solve for x
    x = 169,730,088,118.67/398,992.67
  6. Step 6: Final answer
    x = 425,396.51

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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.