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Finding the Fourth Proportional to 5,380.75, 8,071.43 and 1,918

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Solution

The fourth proportional to 5,380.75, 8,071.43 and 1,918 is: 2,877.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,380.75 : 8,071.43 = 1,918 : x
  2. Step 2: Convert to fraction form
    5,380.75/8,071.43 = 1,918/x
  3. Step 3: Cross multiply
    5,380.75x = 8,071.43 × 1,918
  4. Step 4: Simplify right side
    5,380.75x = 15,481,002.74
  5. Step 5: Solve for x
    x = 15,481,002.74/5,380.75
  6. Step 6: Final answer
    x = 2,877.11

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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.