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Finding the Fourth Proportional to 258,579.08, 387,745.34 and 90,078.68

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Solution

The fourth proportional to 258,579.08, 387,745.34 and 90,078.68 is: 135,075.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,579.08 : 387,745.34 = 90,078.68 : x
  2. Step 2: Convert to fraction form
    258,579.08/387,745.34 = 90,078.68/x
  3. Step 3: Cross multiply
    258,579.08x = 387,745.34 × 90,078.68
  4. Step 4: Simplify right side
    258,579.08x = 34,927,588,403.35
  5. Step 5: Solve for x
    x = 34,927,588,403.35/258,579.08
  6. Step 6: Final answer
    x = 135,075.07

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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.