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Finding the Fourth Proportional to 18,919.20, 28,378.80 and 12,698.40

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Solution

The fourth proportional to 18,919.20, 28,378.80 and 12,698.40 is: 19,047.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.20 : 28,378.80 = 12,698.40 : x
  2. Step 2: Convert to fraction form
    18,919.20/28,378.80 = 12,698.40/x
  3. Step 3: Cross multiply
    18,919.20x = 28,378.80 × 12,698.40
  4. Step 4: Simplify right side
    18,919.20x = 360,365,353.92
  5. Step 5: Solve for x
    x = 360,365,353.92/18,919.20
  6. Step 6: Final answer
    x = 19,047.60

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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.