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Finding the Fourth Proportional to 251,403.20, 377,104.80 and 139,428.80

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Solution

The fourth proportional to 251,403.20, 377,104.80 and 139,428.80 is: 209,143.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    251,403.20 : 377,104.80 = 139,428.80 : x
  2. Step 2: Convert to fraction form
    251,403.20/377,104.80 = 139,428.80/x
  3. Step 3: Cross multiply
    251,403.20x = 377,104.80 × 139,428.80
  4. Step 4: Simplify right side
    251,403.20x = 52,579,269,738.24
  5. Step 5: Solve for x
    x = 52,579,269,738.24/251,403.20
  6. Step 6: Final answer
    x = 209,143.20

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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.