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Finding the Fourth Proportional to 72,980.91, 100,713.60 and 39,446.91

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Solution

The fourth proportional to 72,980.91, 100,713.60 and 39,446.91 is: 54,436.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,980.91 : 100,713.60 = 39,446.91 : x
  2. Step 2: Convert to fraction form
    72,980.91/100,713.60 = 39,446.91/x
  3. Step 3: Cross multiply
    72,980.91x = 100,713.60 × 39,446.91
  4. Step 4: Simplify right side
    72,980.91x = 3,972,840,314.98
  5. Step 5: Solve for x
    x = 3,972,840,314.98/72,980.91
  6. Step 6: Final answer
    x = 54,436.71

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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.