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Finding the Fourth Proportional to 21,993.81, 30,310.75 and 15,620.68

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Solution

The fourth proportional to 21,993.81, 30,310.75 and 15,620.68 is: 21,527.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,993.81 : 30,310.75 = 15,620.68 : x
  2. Step 2: Convert to fraction form
    21,993.81/30,310.75 = 15,620.68/x
  3. Step 3: Cross multiply
    21,993.81x = 30,310.75 × 15,620.68
  4. Step 4: Simplify right side
    21,993.81x = 473,474,296.65
  5. Step 5: Solve for x
    x = 473,474,296.65/21,993.81
  6. Step 6: Final answer
    x = 21,527.62

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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.