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Finding the Fourth Proportional to 509,213.40, 764,636.10 and 404,899.80

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Solution

The fourth proportional to 509,213.40, 764,636.10 and 404,899.80 is: 607,998.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,213.40 : 764,636.10 = 404,899.80 : x
  2. Step 2: Convert to fraction form
    509,213.40/764,636.10 = 404,899.80/x
  3. Step 3: Cross multiply
    509,213.40x = 764,636.10 × 404,899.80
  4. Step 4: Simplify right side
    509,213.40x = 309,601,003,962.78
  5. Step 5: Solve for x
    x = 309,601,003,962.78/509,213.40
  6. Step 6: Final answer
    x = 607,998.54

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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.