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Finding the Fourth Proportional to 18,967.20, 28,392.40 and 12,379.20

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Solution

The fourth proportional to 18,967.20, 28,392.40 and 12,379.20 is: 18,530.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,967.20 : 28,392.40 = 12,379.20 : x
  2. Step 2: Convert to fraction form
    18,967.20/28,392.40 = 12,379.20/x
  3. Step 3: Cross multiply
    18,967.20x = 28,392.40 × 12,379.20
  4. Step 4: Simplify right side
    18,967.20x = 351,475,198.08
  5. Step 5: Solve for x
    x = 351,475,198.08/18,967.20
  6. Step 6: Final answer
    x = 18,530.68

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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.