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Finding the Fourth Proportional to 641,722.40, 961,546.80 and 404,640.80

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Solution

The fourth proportional to 641,722.40, 961,546.80 and 404,640.80 is: 606,307.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,722.40 : 961,546.80 = 404,640.80 : x
  2. Step 2: Convert to fraction form
    641,722.40/961,546.80 = 404,640.80/x
  3. Step 3: Cross multiply
    641,722.40x = 961,546.80 × 404,640.80
  4. Step 4: Simplify right side
    641,722.40x = 389,081,066,389.44
  5. Step 5: Solve for x
    x = 389,081,066,389.44/641,722.40
  6. Step 6: Final answer
    x = 606,307.44

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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.