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Finding the Fourth Proportional to 441,128.40, 661,692.60 and 420,853.20

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Solution

The fourth proportional to 441,128.40, 661,692.60 and 420,853.20 is: 631,279.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    441,128.40 : 661,692.60 = 420,853.20 : x
  2. Step 2: Convert to fraction form
    441,128.40/661,692.60 = 420,853.20/x
  3. Step 3: Cross multiply
    441,128.40x = 661,692.60 × 420,853.20
  4. Step 4: Simplify right side
    441,128.40x = 278,475,448,126.32
  5. Step 5: Solve for x
    x = 278,475,448,126.32/441,128.40
  6. Step 6: Final answer
    x = 631,279.80

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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.