Home / 405,816.37-608,718.39-139,579.21

Finding the Fourth Proportional to 405,816.37, 608,718.39 and 139,579.21

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Solution

The fourth proportional to 405,816.37, 608,718.39 and 139,579.21 is: 209,366.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,816.37 : 608,718.39 = 139,579.21 : x
  2. Step 2: Convert to fraction form
    405,816.37/608,718.39 = 139,579.21/x
  3. Step 3: Cross multiply
    405,816.37x = 608,718.39 × 139,579.21
  4. Step 4: Simplify right side
    405,816.37x = 84,964,431,988.67
  5. Step 5: Solve for x
    x = 84,964,431,988.67/405,816.37
  6. Step 6: Final answer
    x = 209,366.69

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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.