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Finding the Fourth Proportional to 18,711.90, 28,069.20 and 11,300.40

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Solution

The fourth proportional to 18,711.90, 28,069.20 and 11,300.40 is: 16,951.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711.90 : 28,069.20 = 11,300.40 : x
  2. Step 2: Convert to fraction form
    18,711.90/28,069.20 = 11,300.40/x
  3. Step 3: Cross multiply
    18,711.90x = 28,069.20 × 11,300.40
  4. Step 4: Simplify right side
    18,711.90x = 317,193,187.68
  5. Step 5: Solve for x
    x = 317,193,187.68/18,711.90
  6. Step 6: Final answer
    x = 16,951.42

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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.