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Finding the Fourth Proportional to 18,690.80, 28,036.20 and 16,811.60

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Solution

The fourth proportional to 18,690.80, 28,036.20 and 16,811.60 is: 25,217.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,690.80 : 28,036.20 = 16,811.60 : x
  2. Step 2: Convert to fraction form
    18,690.80/28,036.20 = 16,811.60/x
  3. Step 3: Cross multiply
    18,690.80x = 28,036.20 × 16,811.60
  4. Step 4: Simplify right side
    18,690.80x = 471,333,379.92
  5. Step 5: Solve for x
    x = 471,333,379.92/18,690.80
  6. Step 6: Final answer
    x = 25,217.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.