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Finding the Fourth Proportional to 405,786.80, 608,534.40 and 206,040.80

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Solution

The fourth proportional to 405,786.80, 608,534.40 and 206,040.80 is: 308,987.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,786.80 : 608,534.40 = 206,040.80 : x
  2. Step 2: Convert to fraction form
    405,786.80/608,534.40 = 206,040.80/x
  3. Step 3: Cross multiply
    405,786.80x = 608,534.40 × 206,040.80
  4. Step 4: Simplify right side
    405,786.80x = 125,382,914,603.52
  5. Step 5: Solve for x
    x = 125,382,914,603.52/405,786.80
  6. Step 6: Final answer
    x = 308,987.17

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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.