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Finding the Fourth Proportional to 65,940.36, 90,981.90 and 39,078.24

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Solution

The fourth proportional to 65,940.36, 90,981.90 and 39,078.24 is: 53,918.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,940.36 : 90,981.90 = 39,078.24 : x
  2. Step 2: Convert to fraction form
    65,940.36/90,981.90 = 39,078.24/x
  3. Step 3: Cross multiply
    65,940.36x = 90,981.90 × 39,078.24
  4. Step 4: Simplify right side
    65,940.36x = 3,555,412,523.86
  5. Step 5: Solve for x
    x = 3,555,412,523.86/65,940.36
  6. Step 6: Final answer
    x = 53,918.61

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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.