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Finding the Fourth Proportional to 424,091.20, 636,136.80 and 405,889.60

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Solution

The fourth proportional to 424,091.20, 636,136.80 and 405,889.60 is: 608,834.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    424,091.20 : 636,136.80 = 405,889.60 : x
  2. Step 2: Convert to fraction form
    424,091.20/636,136.80 = 405,889.60/x
  3. Step 3: Cross multiply
    424,091.20x = 636,136.80 × 405,889.60
  4. Step 4: Simplify right side
    424,091.20x = 258,201,311,297.28
  5. Step 5: Solve for x
    x = 258,201,311,297.28/424,091.20
  6. Step 6: Final answer
    x = 608,834.40

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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.