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Finding the Fourth Proportional to 18,917.84, 28,377.84 and 5,771.12

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Solution

The fourth proportional to 18,917.84, 28,377.84 and 5,771.12 is: 8,657.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.84 : 28,377.84 = 5,771.12 : x
  2. Step 2: Convert to fraction form
    18,917.84/28,377.84 = 5,771.12/x
  3. Step 3: Cross multiply
    18,917.84x = 28,377.84 × 5,771.12
  4. Step 4: Simplify right side
    18,917.84x = 163,771,919.98
  5. Step 5: Solve for x
    x = 163,771,919.98/18,917.84
  6. Step 6: Final answer
    x = 8,657.01

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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.