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Finding the Fourth Proportional to 425,613.40, 638,420.10 and 419,392.60

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Solution

The fourth proportional to 425,613.40, 638,420.10 and 419,392.60 is: 629,088.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,613.40 : 638,420.10 = 419,392.60 : x
  2. Step 2: Convert to fraction form
    425,613.40/638,420.10 = 419,392.60/x
  3. Step 3: Cross multiply
    425,613.40x = 638,420.10 × 419,392.60
  4. Step 4: Simplify right side
    425,613.40x = 267,748,665,631.26
  5. Step 5: Solve for x
    x = 267,748,665,631.26/425,613.40
  6. Step 6: Final answer
    x = 629,088.90

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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.