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Finding the Fourth Proportional to 419,885.70, 629,828.55 and 345,090.30

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Solution

The fourth proportional to 419,885.70, 629,828.55 and 345,090.30 is: 517,635.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,885.70 : 629,828.55 = 345,090.30 : x
  2. Step 2: Convert to fraction form
    419,885.70/629,828.55 = 345,090.30/x
  3. Step 3: Cross multiply
    419,885.70x = 629,828.55 × 345,090.30
  4. Step 4: Simplify right side
    419,885.70x = 217,347,723,268.07
  5. Step 5: Solve for x
    x = 217,347,723,268.07/419,885.70
  6. Step 6: Final answer
    x = 517,635.45

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Similar ratio
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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.