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Finding the Fourth Proportional to 425,647.40, 638,471.10 and 404,911.40

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Solution

The fourth proportional to 425,647.40, 638,471.10 and 404,911.40 is: 607,367.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,647.40 : 638,471.10 = 404,911.40 : x
  2. Step 2: Convert to fraction form
    425,647.40/638,471.10 = 404,911.40/x
  3. Step 3: Cross multiply
    425,647.40x = 638,471.10 × 404,911.40
  4. Step 4: Simplify right side
    425,647.40x = 258,524,226,960.54
  5. Step 5: Solve for x
    x = 258,524,226,960.54/425,647.40
  6. Step 6: Final answer
    x = 607,367.10

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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.