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Finding the Fourth Proportional to 405,282.85, 607,936.57 and 139,039.49

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Solution

The fourth proportional to 405,282.85, 607,936.57 and 139,039.49 is: 208,563.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,282.85 : 607,936.57 = 139,039.49 : x
  2. Step 2: Convert to fraction form
    405,282.85/607,936.57 = 139,039.49/x
  3. Step 3: Cross multiply
    405,282.85x = 607,936.57 × 139,039.49
  4. Step 4: Simplify right side
    405,282.85x = 84,527,190,645.15
  5. Step 5: Solve for x
    x = 84,527,190,645.15/405,282.85
  6. Step 6: Final answer
    x = 208,563.45

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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.