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Finding the Fourth Proportional to 72,980.79, 100,713.44 and 39,446.79

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Solution

The fourth proportional to 72,980.79, 100,713.44 and 39,446.79 is: 54,436.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,980.79 : 100,713.44 = 39,446.79 : x
  2. Step 2: Convert to fraction form
    72,980.79/100,713.44 = 39,446.79/x
  3. Step 3: Cross multiply
    72,980.79x = 100,713.44 × 39,446.79
  4. Step 4: Simplify right side
    72,980.79x = 3,972,821,917.86
  5. Step 5: Solve for x
    x = 3,972,821,917.86/72,980.79
  6. Step 6: Final answer
    x = 54,436.54

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1.5x scale

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.