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Finding the Fourth Proportional to 405,845.40, 608,768.10 and 321,864.60

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Solution

The fourth proportional to 405,845.40, 608,768.10 and 321,864.60 is: 482,796.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,845.40 : 608,768.10 = 321,864.60 : x
  2. Step 2: Convert to fraction form
    405,845.40/608,768.10 = 321,864.60/x
  3. Step 3: Cross multiply
    405,845.40x = 608,768.10 × 321,864.60
  4. Step 4: Simplify right side
    405,845.40x = 195,940,900,999.26
  5. Step 5: Solve for x
    x = 195,940,900,999.26/405,845.40
  6. Step 6: Final answer
    x = 482,796.90

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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.