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Finding the Fourth Proportional to 641,720.40, 961,543.80 and 404,638.80

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Solution

The fourth proportional to 641,720.40, 961,543.80 and 404,638.80 is: 606,304.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,720.40 : 961,543.80 = 404,638.80 : x
  2. Step 2: Convert to fraction form
    641,720.40/961,543.80 = 404,638.80/x
  3. Step 3: Cross multiply
    641,720.40x = 961,543.80 × 404,638.80
  4. Step 4: Simplify right side
    641,720.40x = 389,077,929,379.44
  5. Step 5: Solve for x
    x = 389,077,929,379.44/641,720.40
  6. Step 6: Final answer
    x = 606,304.44

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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.