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Finding the Fourth Proportional to 18,685.80, 25,751.88 and 15,844.08

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Solution

The fourth proportional to 18,685.80, 25,751.88 and 15,844.08 is: 21,835.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685.80 : 25,751.88 = 15,844.08 : x
  2. Step 2: Convert to fraction form
    18,685.80/25,751.88 = 15,844.08/x
  3. Step 3: Cross multiply
    18,685.80x = 25,751.88 × 15,844.08
  4. Step 4: Simplify right side
    18,685.80x = 408,014,846.87
  5. Step 5: Solve for x
    x = 408,014,846.87/18,685.80
  6. Step 6: Final answer
    x = 21,835.56

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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.