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Finding the Fourth Proportional to 393,410.40, 590,115.60 and 389,911.20

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Solution

The fourth proportional to 393,410.40, 590,115.60 and 389,911.20 is: 584,866.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,410.40 : 590,115.60 = 389,911.20 : x
  2. Step 2: Convert to fraction form
    393,410.40/590,115.60 = 389,911.20/x
  3. Step 3: Cross multiply
    393,410.40x = 590,115.60 × 389,911.20
  4. Step 4: Simplify right side
    393,410.40x = 230,092,681,734.72
  5. Step 5: Solve for x
    x = 230,092,681,734.72/393,410.40
  6. Step 6: Final answer
    x = 584,866.80

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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.