Home / 405,815.37-608,716.89-139,578.21

Finding the Fourth Proportional to 405,815.37, 608,716.89 and 139,578.21

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Solution

The fourth proportional to 405,815.37, 608,716.89 and 139,578.21 is: 209,365.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,815.37 : 608,716.89 = 139,578.21 : x
  2. Step 2: Convert to fraction form
    405,815.37/608,716.89 = 139,578.21/x
  3. Step 3: Cross multiply
    405,815.37x = 608,716.89 × 139,578.21
  4. Step 4: Simplify right side
    405,815.37x = 84,963,613,902.97
  5. Step 5: Solve for x
    x = 84,963,613,902.97/405,815.37
  6. Step 6: Final answer
    x = 209,365.19

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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.