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Finding the Fourth Proportional to 1,219,640.82, 1,829,751.90 and 420,929.28

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Solution

The fourth proportional to 1,219,640.82, 1,829,751.90 and 420,929.28 is: 631,494.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219,640.82 : 1,829,751.90 = 420,929.28 : x
  2. Step 2: Convert to fraction form
    1,219,640.82/1,829,751.90 = 420,929.28/x
  3. Step 3: Cross multiply
    1,219,640.82x = 1,829,751.90 × 420,929.28
  4. Step 4: Simplify right side
    1,219,640.82x = 770,196,149,845.63
  5. Step 5: Solve for x
    x = 770,196,149,845.63/1,219,640.82
  6. Step 6: Final answer
    x = 631,494.24

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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.