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Finding the Fourth Proportional to 431,390.80, 647,086.20 and 305,419.60

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Solution

The fourth proportional to 431,390.80, 647,086.20 and 305,419.60 is: 458,129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,390.80 : 647,086.20 = 305,419.60 : x
  2. Step 2: Convert to fraction form
    431,390.80/647,086.20 = 305,419.60/x
  3. Step 3: Cross multiply
    431,390.80x = 647,086.20 × 305,419.60
  4. Step 4: Simplify right side
    431,390.80x = 197,632,808,369.52
  5. Step 5: Solve for x
    x = 197,632,808,369.52/431,390.80
  6. Step 6: Final answer
    x = 458,129.40

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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.