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Finding the Fourth Proportional to 425,872.40, 638,808.60 and 405,136.40

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Solution

The fourth proportional to 425,872.40, 638,808.60 and 405,136.40 is: 607,704.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,872.40 : 638,808.60 = 405,136.40 : x
  2. Step 2: Convert to fraction form
    425,872.40/638,808.60 = 405,136.40/x
  3. Step 3: Cross multiply
    425,872.40x = 638,808.60 × 405,136.40
  4. Step 4: Simplify right side
    425,872.40x = 258,804,616,493.04
  5. Step 5: Solve for x
    x = 258,804,616,493.04/425,872.40
  6. Step 6: Final answer
    x = 607,704.60

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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.