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Finding the Fourth Proportional to 392,939, 589,408.50 and 143,621

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Solution

The fourth proportional to 392,939, 589,408.50 and 143,621 is: 215,431.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,939 : 589,408.50 = 143,621 : x
  2. Step 2: Convert to fraction form
    392,939/589,408.50 = 143,621/x
  3. Step 3: Cross multiply
    392,939x = 589,408.50 × 143,621
  4. Step 4: Simplify right side
    392,939x = 84,651,438,178.50
  5. Step 5: Solve for x
    x = 84,651,438,178.50/392,939
  6. Step 6: Final answer
    x = 215,431.50

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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.