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Finding the Fourth Proportional to 455,189.20, 682,783.80 and 278,042.20

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Solution

The fourth proportional to 455,189.20, 682,783.80 and 278,042.20 is: 417,063.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,189.20 : 682,783.80 = 278,042.20 : x
  2. Step 2: Convert to fraction form
    455,189.20/682,783.80 = 278,042.20/x
  3. Step 3: Cross multiply
    455,189.20x = 682,783.80 × 278,042.20
  4. Step 4: Simplify right side
    455,189.20x = 189,842,709,876.36
  5. Step 5: Solve for x
    x = 189,842,709,876.36/455,189.20
  6. Step 6: Final answer
    x = 417,063.30

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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.