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Finding the Fourth Proportional to 330,425.69, 495,639 and 81,107.69

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Solution

The fourth proportional to 330,425.69, 495,639 and 81,107.69 is: 121,661.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    330,425.69 : 495,639 = 81,107.69 : x
  2. Step 2: Convert to fraction form
    330,425.69/495,639 = 81,107.69/x
  3. Step 3: Cross multiply
    330,425.69x = 495,639 × 81,107.69
  4. Step 4: Simplify right side
    330,425.69x = 40,200,131,885.72
  5. Step 5: Solve for x
    x = 40,200,131,885.72/330,425.69
  6. Step 6: Final answer
    x = 121,661.64

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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.