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Finding the Fourth Proportional to 646,137.20, 891,662.76 and 355,739.60

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Solution

The fourth proportional to 646,137.20, 891,662.76 and 355,739.60 is: 490,917.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    646,137.20 : 891,662.76 = 355,739.60 : x
  2. Step 2: Convert to fraction form
    646,137.20/891,662.76 = 355,739.60/x
  3. Step 3: Cross multiply
    646,137.20x = 891,662.76 × 355,739.60
  4. Step 4: Simplify right side
    646,137.20x = 317,199,753,577.30
  5. Step 5: Solve for x
    x = 317,199,753,577.30/646,137.20
  6. Step 6: Final answer
    x = 490,917.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.