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Finding the Fourth Proportional to 426,309.30, 639,809.55 and 412,485.30

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Solution

The fourth proportional to 426,309.30, 639,809.55 and 412,485.30 is: 619,062.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,309.30 : 639,809.55 = 412,485.30 : x
  2. Step 2: Convert to fraction form
    426,309.30/639,809.55 = 412,485.30/x
  3. Step 3: Cross multiply
    426,309.30x = 639,809.55 × 412,485.30
  4. Step 4: Simplify right side
    426,309.30x = 263,912,034,174.62
  5. Step 5: Solve for x
    x = 263,912,034,174.62/426,309.30
  6. Step 6: Final answer
    x = 619,062.34

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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.