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Finding the Fourth Proportional to 425,438.60, 638,676.30 and 422,328.20

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Solution

The fourth proportional to 425,438.60, 638,676.30 and 422,328.20 is: 634,006.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,438.60 : 638,676.30 = 422,328.20 : x
  2. Step 2: Convert to fraction form
    425,438.60/638,676.30 = 422,328.20/x
  3. Step 3: Cross multiply
    425,438.60x = 638,676.30 × 422,328.20
  4. Step 4: Simplify right side
    425,438.60x = 269,731,012,161.66
  5. Step 5: Solve for x
    x = 269,731,012,161.66/425,438.60
  6. Step 6: Final answer
    x = 634,006.91

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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.