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Finding the Fourth Proportional to 303,436.20, 455,672.70 and 198,719.40

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Solution

The fourth proportional to 303,436.20, 455,672.70 and 198,719.40 is: 298,418.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    303,436.20 : 455,672.70 = 198,719.40 : x
  2. Step 2: Convert to fraction form
    303,436.20/455,672.70 = 198,719.40/x
  3. Step 3: Cross multiply
    303,436.20x = 455,672.70 × 198,719.40
  4. Step 4: Simplify right side
    303,436.20x = 90,551,005,540.38
  5. Step 5: Solve for x
    x = 90,551,005,540.38/303,436.20
  6. Step 6: Final answer
    x = 298,418.60

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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.