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Finding the Fourth Proportional to 72,980.70, 100,713.15 and 39,446.70

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Solution

The fourth proportional to 72,980.70, 100,713.15 and 39,446.70 is: 54,436.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,980.70 : 100,713.15 = 39,446.70 : x
  2. Step 2: Convert to fraction form
    72,980.70/100,713.15 = 39,446.70/x
  3. Step 3: Cross multiply
    72,980.70x = 100,713.15 × 39,446.70
  4. Step 4: Simplify right side
    72,980.70x = 3,972,801,414.11
  5. Step 5: Solve for x
    x = 3,972,801,414.11/72,980.70
  6. Step 6: Final answer
    x = 54,436.33

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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.