Home / 491,135.21-677,705.96-309,778.64

Finding the Fourth Proportional to 491,135.21, 677,705.96 and 309,778.64

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Solution

The fourth proportional to 491,135.21, 677,705.96 and 309,778.64 is: 427,456.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,135.21 : 677,705.96 = 309,778.64 : x
  2. Step 2: Convert to fraction form
    491,135.21/677,705.96 = 309,778.64/x
  3. Step 3: Cross multiply
    491,135.21x = 677,705.96 × 309,778.64
  4. Step 4: Simplify right side
    491,135.21x = 209,938,825,671.27
  5. Step 5: Solve for x
    x = 209,938,825,671.27/491,135.21
  6. Step 6: Final answer
    x = 427,456.28

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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.