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Finding the Fourth Proportional to 2,165.97, 2,989.07 and 1,221.68

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Solution

The fourth proportional to 2,165.97, 2,989.07 and 1,221.68 is: 1,685.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.97 : 2,989.07 = 1,221.68 : x
  2. Step 2: Convert to fraction form
    2,165.97/2,989.07 = 1,221.68/x
  3. Step 3: Cross multiply
    2,165.97x = 2,989.07 × 1,221.68
  4. Step 4: Simplify right side
    2,165.97x = 3,651,665.98
  5. Step 5: Solve for x
    x = 3,651,665.98/2,165.97
  6. Step 6: Final answer
    x = 1,685.93

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1.5x scale

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.