Home / 2,116.78-2,921.11-1,172.64

Finding the Fourth Proportional to 2,116.78, 2,921.11 and 1,172.64

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Solution

The fourth proportional to 2,116.78, 2,921.11 and 1,172.64 is: 1,618.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,116.78 : 2,921.11 = 1,172.64 : x
  2. Step 2: Convert to fraction form
    2,116.78/2,921.11 = 1,172.64/x
  3. Step 3: Cross multiply
    2,116.78x = 2,921.11 × 1,172.64
  4. Step 4: Simplify right side
    2,116.78x = 3,425,410.43
  5. Step 5: Solve for x
    x = 3,425,410.43/2,116.78
  6. Step 6: Final answer
    x = 1,618.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.