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Finding the Fourth Proportional to 289,916.20, 436,040.70 and 259,589.80

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Solution

The fourth proportional to 289,916.20, 436,040.70 and 259,589.80 is: 390,429.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,916.20 : 436,040.70 = 259,589.80 : x
  2. Step 2: Convert to fraction form
    289,916.20/436,040.70 = 259,589.80/x
  3. Step 3: Cross multiply
    289,916.20x = 436,040.70 × 259,589.80
  4. Step 4: Simplify right side
    289,916.20x = 113,191,718,104.86
  5. Step 5: Solve for x
    x = 113,191,718,104.86/289,916.20
  6. Step 6: Final answer
    x = 390,429.09

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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.