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Finding the Fourth Proportional to 2,916.78, 4,375.14 and 1,185.36

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Solution

The fourth proportional to 2,916.78, 4,375.14 and 1,185.36 is: 1,778.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,916.78 : 4,375.14 = 1,185.36 : x
  2. Step 2: Convert to fraction form
    2,916.78/4,375.14 = 1,185.36/x
  3. Step 3: Cross multiply
    2,916.78x = 4,375.14 × 1,185.36
  4. Step 4: Simplify right side
    2,916.78x = 5,186,115.95
  5. Step 5: Solve for x
    x = 5,186,115.95/2,916.78
  6. Step 6: Final answer
    x = 1,778.03

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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.