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Finding the Fourth Proportional to 5,278.56, 7,918.68 and 1,815

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Solution

The fourth proportional to 5,278.56, 7,918.68 and 1,815 is: 2,722.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,278.56 : 7,918.68 = 1,815 : x
  2. Step 2: Convert to fraction form
    5,278.56/7,918.68 = 1,815/x
  3. Step 3: Cross multiply
    5,278.56x = 7,918.68 × 1,815
  4. Step 4: Simplify right side
    5,278.56x = 14,372,404.20
  5. Step 5: Solve for x
    x = 14,372,404.20/5,278.56
  6. Step 6: Final answer
    x = 2,722.79

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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.