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Finding the Fourth Proportional to 439,615.80, 659,423.70 and 328,078.80

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Solution

The fourth proportional to 439,615.80, 659,423.70 and 328,078.80 is: 492,118.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,615.80 : 659,423.70 = 328,078.80 : x
  2. Step 2: Convert to fraction form
    439,615.80/659,423.70 = 328,078.80/x
  3. Step 3: Cross multiply
    439,615.80x = 659,423.70 × 328,078.80
  4. Step 4: Simplify right side
    439,615.80x = 216,342,936,187.56
  5. Step 5: Solve for x
    x = 216,342,936,187.56/439,615.80
  6. Step 6: Final answer
    x = 492,118.20

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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.