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Finding the Fourth Proportional to 863,405.20, 1,294,493.40 and 330,720.40

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Solution

The fourth proportional to 863,405.20, 1,294,493.40 and 330,720.40 is: 495,845.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    863,405.20 : 1,294,493.40 = 330,720.40 : x
  2. Step 2: Convert to fraction form
    863,405.20/1,294,493.40 = 330,720.40/x
  3. Step 3: Cross multiply
    863,405.20x = 1,294,493.40 × 330,720.40
  4. Step 4: Simplify right side
    863,405.20x = 428,115,375,045.36
  5. Step 5: Solve for x
    x = 428,115,375,045.36/863,405.20
  6. Step 6: Final answer
    x = 495,845.26

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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.