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Finding the Fourth Proportional to 18,928.06, 28,378.82 and 8,392.39

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Solution

The fourth proportional to 18,928.06, 28,378.82 and 8,392.39 is: 12,582.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928.06 : 28,378.82 = 8,392.39 : x
  2. Step 2: Convert to fraction form
    18,928.06/28,378.82 = 8,392.39/x
  3. Step 3: Cross multiply
    18,928.06x = 28,378.82 × 8,392.39
  4. Step 4: Simplify right side
    18,928.06x = 238,166,125.18
  5. Step 5: Solve for x
    x = 238,166,125.18/18,928.06
  6. Step 6: Final answer
    x = 12,582.70

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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.