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Finding the Fourth Proportional to 455,129.33, 628,057.19 and 261,400.78

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Solution

The fourth proportional to 455,129.33, 628,057.19 and 261,400.78 is: 360,720.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,129.33 : 628,057.19 = 261,400.78 : x
  2. Step 2: Convert to fraction form
    455,129.33/628,057.19 = 261,400.78/x
  3. Step 3: Cross multiply
    455,129.33x = 628,057.19 × 261,400.78
  4. Step 4: Simplify right side
    455,129.33x = 164,174,638,433.97
  5. Step 5: Solve for x
    x = 164,174,638,433.97/455,129.33
  6. Step 6: Final answer
    x = 360,720.85

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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.