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Finding the Fourth Proportional to 72,933, 100,647.60 and 39,399

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Solution

The fourth proportional to 72,933, 100,647.60 and 39,399 is: 54,370.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,933 : 100,647.60 = 39,399 : x
  2. Step 2: Convert to fraction form
    72,933/100,647.60 = 39,399/x
  3. Step 3: Cross multiply
    72,933x = 100,647.60 × 39,399
  4. Step 4: Simplify right side
    72,933x = 3,965,414,792.40
  5. Step 5: Solve for x
    x = 3,965,414,792.40/72,933
  6. Step 6: Final answer
    x = 54,370.65

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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.