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Finding the Fourth Proportional to 30,290.87, 41,836.40 and 20,201.78

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Solution

The fourth proportional to 30,290.87, 41,836.40 and 20,201.78 is: 27,901.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,290.87 : 41,836.40 = 20,201.78 : x
  2. Step 2: Convert to fraction form
    30,290.87/41,836.40 = 20,201.78/x
  3. Step 3: Cross multiply
    30,290.87x = 41,836.40 × 20,201.78
  4. Step 4: Simplify right side
    30,290.87x = 845,169,671.24
  5. Step 5: Solve for x
    x = 845,169,671.24/30,290.87
  6. Step 6: Final answer
    x = 27,901.79

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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.