Home / 2,116.80-2,921.12-1,172.57

Finding the Fourth Proportional to 2,116.80, 2,921.12 and 1,172.57

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Solution

The fourth proportional to 2,116.80, 2,921.12 and 1,172.57 is: 1,618.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,116.80 : 2,921.12 = 1,172.57 : x
  2. Step 2: Convert to fraction form
    2,116.80/2,921.12 = 1,172.57/x
  3. Step 3: Cross multiply
    2,116.80x = 2,921.12 × 1,172.57
  4. Step 4: Simplify right side
    2,116.80x = 3,425,201.61
  5. Step 5: Solve for x
    x = 3,425,201.61/2,116.80
  6. Step 6: Final answer
    x = 1,618.10

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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.