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Finding the Fourth Proportional to 442,990.20, 664,485.30 and 310,279.80

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Solution

The fourth proportional to 442,990.20, 664,485.30 and 310,279.80 is: 465,419.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    442,990.20 : 664,485.30 = 310,279.80 : x
  2. Step 2: Convert to fraction form
    442,990.20/664,485.30 = 310,279.80/x
  3. Step 3: Cross multiply
    442,990.20x = 664,485.30 × 310,279.80
  4. Step 4: Simplify right side
    442,990.20x = 206,176,365,986.94
  5. Step 5: Solve for x
    x = 206,176,365,986.94/442,990.20
  6. Step 6: Final answer
    x = 465,419.70

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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.