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Finding the Fourth Proportional to 486,940.20, 730,410.30 and 318,978.60

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Solution

The fourth proportional to 486,940.20, 730,410.30 and 318,978.60 is: 478,467.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,940.20 : 730,410.30 = 318,978.60 : x
  2. Step 2: Convert to fraction form
    486,940.20/730,410.30 = 318,978.60/x
  3. Step 3: Cross multiply
    486,940.20x = 730,410.30 × 318,978.60
  4. Step 4: Simplify right side
    486,940.20x = 232,985,254,919.58
  5. Step 5: Solve for x
    x = 232,985,254,919.58/486,940.20
  6. Step 6: Final answer
    x = 478,467.90

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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.