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Finding the Fourth Proportional to 39,898.20, 55,059.88 and 21,993.88

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Solution

The fourth proportional to 39,898.20, 55,059.88 and 21,993.88 is: 30,351.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,898.20 : 55,059.88 = 21,993.88 : x
  2. Step 2: Convert to fraction form
    39,898.20/55,059.88 = 21,993.88/x
  3. Step 3: Cross multiply
    39,898.20x = 55,059.88 × 21,993.88
  4. Step 4: Simplify right side
    39,898.20x = 1,210,980,393.53
  5. Step 5: Solve for x
    x = 1,210,980,393.53/39,898.20
  6. Step 6: Final answer
    x = 30,351.76

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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.