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Finding the Fourth Proportional to 289,872.51, 399,821.67 and 280,118.49

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Solution

The fourth proportional to 289,872.51, 399,821.67 and 280,118.49 is: 386,367.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,872.51 : 399,821.67 = 280,118.49 : x
  2. Step 2: Convert to fraction form
    289,872.51/399,821.67 = 280,118.49/x
  3. Step 3: Cross multiply
    289,872.51x = 399,821.67 × 280,118.49
  4. Step 4: Simplify right side
    289,872.51x = 111,997,442,469.68
  5. Step 5: Solve for x
    x = 111,997,442,469.68/289,872.51
  6. Step 6: Final answer
    x = 386,367.93

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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.