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Finding the Fourth Proportional to 303,990.56, 455,906.40 and 90,708.32

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Solution

The fourth proportional to 303,990.56, 455,906.40 and 90,708.32 is: 136,038.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    303,990.56 : 455,906.40 = 90,708.32 : x
  2. Step 2: Convert to fraction form
    303,990.56/455,906.40 = 90,708.32/x
  3. Step 3: Cross multiply
    303,990.56x = 455,906.40 × 90,708.32
  4. Step 4: Simplify right side
    303,990.56x = 41,354,503,621.25
  5. Step 5: Solve for x
    x = 41,354,503,621.25/303,990.56
  6. Step 6: Final answer
    x = 136,038.78

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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.