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Finding the Fourth Proportional to 216,879.35, 324,845.22 and 90,135.32

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Solution

The fourth proportional to 216,879.35, 324,845.22 and 90,135.32 is: 135,006.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,879.35 : 324,845.22 = 90,135.32 : x
  2. Step 2: Convert to fraction form
    216,879.35/324,845.22 = 90,135.32/x
  3. Step 3: Cross multiply
    216,879.35x = 324,845.22 × 90,135.32
  4. Step 4: Simplify right side
    216,879.35x = 29,280,027,855.17
  5. Step 5: Solve for x
    x = 29,280,027,855.17/216,879.35
  6. Step 6: Final answer
    x = 135,006.07

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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.