Home / 2,166.28-2,989.25-1,221.98

Finding the Fourth Proportional to 2,166.28, 2,989.25 and 1,221.98

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Solution

The fourth proportional to 2,166.28, 2,989.25 and 1,221.98 is: 1,686.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,166.28 : 2,989.25 = 1,221.98 : x
  2. Step 2: Convert to fraction form
    2,166.28/2,989.25 = 1,221.98/x
  3. Step 3: Cross multiply
    2,166.28x = 2,989.25 × 1,221.98
  4. Step 4: Simplify right side
    2,166.28x = 3,652,805.08
  5. Step 5: Solve for x
    x = 3,652,805.08/2,166.28
  6. Step 6: Final answer
    x = 1,686.21

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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.