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Finding the Fourth Proportional to 418,742.20, 628,113.30 and 399,496.60

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Solution

The fourth proportional to 418,742.20, 628,113.30 and 399,496.60 is: 599,244.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,742.20 : 628,113.30 = 399,496.60 : x
  2. Step 2: Convert to fraction form
    418,742.20/628,113.30 = 399,496.60/x
  3. Step 3: Cross multiply
    418,742.20x = 628,113.30 × 399,496.60
  4. Step 4: Simplify right side
    418,742.20x = 250,929,127,764.78
  5. Step 5: Solve for x
    x = 250,929,127,764.78/418,742.20
  6. Step 6: Final answer
    x = 599,244.90

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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.