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Finding the Fourth Proportional to 641,820.20, 885,744.53 and 355,371.80

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Solution

The fourth proportional to 641,820.20, 885,744.53 and 355,371.80 is: 490,431.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,820.20 : 885,744.53 = 355,371.80 : x
  2. Step 2: Convert to fraction form
    641,820.20/885,744.53 = 355,371.80/x
  3. Step 3: Cross multiply
    641,820.20x = 885,744.53 × 355,371.80
  4. Step 4: Simplify right side
    641,820.20x = 314,768,621,760.67
  5. Step 5: Solve for x
    x = 314,768,621,760.67/641,820.20
  6. Step 6: Final answer
    x = 490,431.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.