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Finding the Fourth Proportional to 425,615.40, 638,423.10 and 419,394.60

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Solution

The fourth proportional to 425,615.40, 638,423.10 and 419,394.60 is: 629,091.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,615.40 : 638,423.10 = 419,394.60 : x
  2. Step 2: Convert to fraction form
    425,615.40/638,423.10 = 419,394.60/x
  3. Step 3: Cross multiply
    425,615.40x = 638,423.10 × 419,394.60
  4. Step 4: Simplify right side
    425,615.40x = 267,751,200,655.26
  5. Step 5: Solve for x
    x = 267,751,200,655.26/425,615.40
  6. Step 6: Final answer
    x = 629,091.90

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1.5x scale

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.