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Finding the Fourth Proportional to 425,930.72, 638,399.28 and 320,410.40

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Solution

The fourth proportional to 425,930.72, 638,399.28 and 320,410.40 is: 480,241.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,930.72 : 638,399.28 = 320,410.40 : x
  2. Step 2: Convert to fraction form
    425,930.72/638,399.28 = 320,410.40/x
  3. Step 3: Cross multiply
    425,930.72x = 638,399.28 × 320,410.40
  4. Step 4: Simplify right side
    425,930.72x = 204,549,768,664.51
  5. Step 5: Solve for x
    x = 204,549,768,664.51/425,930.72
  6. Step 6: Final answer
    x = 480,241.88

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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.