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Finding the Fourth Proportional to 485,430.20, 728,145.30 and 317,468.60

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Solution

The fourth proportional to 485,430.20, 728,145.30 and 317,468.60 is: 476,202.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,430.20 : 728,145.30 = 317,468.60 : x
  2. Step 2: Convert to fraction form
    485,430.20/728,145.30 = 317,468.60/x
  3. Step 3: Cross multiply
    485,430.20x = 728,145.30 × 317,468.60
  4. Step 4: Simplify right side
    485,430.20x = 231,163,268,987.58
  5. Step 5: Solve for x
    x = 231,163,268,987.58/485,430.20
  6. Step 6: Final answer
    x = 476,202.90

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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.