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Finding the Fourth Proportional to 418,910.40, 628,365.60 and 411,998.40

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Solution

The fourth proportional to 418,910.40, 628,365.60 and 411,998.40 is: 617,997.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,910.40 : 628,365.60 = 411,998.40 : x
  2. Step 2: Convert to fraction form
    418,910.40/628,365.60 = 411,998.40/x
  3. Step 3: Cross multiply
    418,910.40x = 628,365.60 × 411,998.40
  4. Step 4: Simplify right side
    418,910.40x = 258,885,621,815.04
  5. Step 5: Solve for x
    x = 258,885,621,815.04/418,910.40
  6. Step 6: Final answer
    x = 617,997.60

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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.