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Finding the Fourth Proportional to 405,664.80, 608,439.60 and 139,437.60

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Solution

The fourth proportional to 405,664.80, 608,439.60 and 139,437.60 is: 209,136.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,664.80 : 608,439.60 = 139,437.60 : x
  2. Step 2: Convert to fraction form
    405,664.80/608,439.60 = 139,437.60/x
  3. Step 3: Cross multiply
    405,664.80x = 608,439.60 × 139,437.60
  4. Step 4: Simplify right side
    405,664.80x = 84,839,357,568.96
  5. Step 5: Solve for x
    x = 84,839,357,568.96/405,664.80
  6. Step 6: Final answer
    x = 209,136.60

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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.