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Finding the Fourth Proportional to 18,697.80, 25,800 and 11,143.96

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Solution

The fourth proportional to 18,697.80, 25,800 and 11,143.96 is: 15,376.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,697.80 : 25,800 = 11,143.96 : x
  2. Step 2: Convert to fraction form
    18,697.80/25,800 = 11,143.96/x
  3. Step 3: Cross multiply
    18,697.80x = 25,800 × 11,143.96
  4. Step 4: Simplify right side
    18,697.80x = 287,514,168
  5. Step 5: Solve for x
    x = 287,514,168/18,697.80
  6. Step 6: Final answer
    x = 15,376.90

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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.