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Finding the Fourth Proportional to 404,431.40, 606,647.10 and 398,210.60

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Solution

The fourth proportional to 404,431.40, 606,647.10 and 398,210.60 is: 597,315.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    404,431.40 : 606,647.10 = 398,210.60 : x
  2. Step 2: Convert to fraction form
    404,431.40/606,647.10 = 398,210.60/x
  3. Step 3: Cross multiply
    404,431.40x = 606,647.10 × 398,210.60
  4. Step 4: Simplify right side
    404,431.40x = 241,573,305,679.26
  5. Step 5: Solve for x
    x = 241,573,305,679.26/404,431.40
  6. Step 6: Final answer
    x = 597,315.90

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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.