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Finding the Fourth Proportional to 425,840.40, 638,760.60 and 405,104.40

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Solution

The fourth proportional to 425,840.40, 638,760.60 and 405,104.40 is: 607,656.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,840.40 : 638,760.60 = 405,104.40 : x
  2. Step 2: Convert to fraction form
    425,840.40/638,760.60 = 405,104.40/x
  3. Step 3: Cross multiply
    425,840.40x = 638,760.60 × 405,104.40
  4. Step 4: Simplify right side
    425,840.40x = 258,764,729,606.64
  5. Step 5: Solve for x
    x = 258,764,729,606.64/425,840.40
  6. Step 6: Final answer
    x = 607,656.60

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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.