Home / 642,858.42-961,449.39-389,438.58

Finding the Fourth Proportional to 642,858.42, 961,449.39 and 389,438.58

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Solution

The fourth proportional to 642,858.42, 961,449.39 and 389,438.58 is: 582,438.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,858.42 : 961,449.39 = 389,438.58 : x
  2. Step 2: Convert to fraction form
    642,858.42/961,449.39 = 389,438.58/x
  3. Step 3: Cross multiply
    642,858.42x = 961,449.39 × 389,438.58
  4. Step 4: Simplify right side
    642,858.42x = 374,425,485,183.47
  5. Step 5: Solve for x
    x = 374,425,485,183.47/642,858.42
  6. Step 6: Final answer
    x = 582,438.49

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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.