Home / 258,626.10-387,939.60-81,146.73

Finding the Fourth Proportional to 258,626.10, 387,939.60 and 81,146.73

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Solution

The fourth proportional to 258,626.10, 387,939.60 and 81,146.73 is: 121,720.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,626.10 : 387,939.60 = 81,146.73 : x
  2. Step 2: Convert to fraction form
    258,626.10/387,939.60 = 81,146.73/x
  3. Step 3: Cross multiply
    258,626.10x = 387,939.60 × 81,146.73
  4. Step 4: Simplify right side
    258,626.10x = 31,480,029,977.51
  5. Step 5: Solve for x
    x = 31,480,029,977.51/258,626.10
  6. Step 6: Final answer
    x = 121,720.24

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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.