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Finding the Fourth Proportional to 18,956.84, 28,435.37 and 8,424.38

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Solution

The fourth proportional to 18,956.84, 28,435.37 and 8,424.38 is: 12,636.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,956.84 : 28,435.37 = 8,424.38 : x
  2. Step 2: Convert to fraction form
    18,956.84/28,435.37 = 8,424.38/x
  3. Step 3: Cross multiply
    18,956.84x = 28,435.37 × 8,424.38
  4. Step 4: Simplify right side
    18,956.84x = 239,550,178.02
  5. Step 5: Solve for x
    x = 239,550,178.02/18,956.84
  6. Step 6: Final answer
    x = 12,636.61

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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.