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Finding the Fourth Proportional to 1,221.11, 1,685.09 and 716.95

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Solution

The fourth proportional to 1,221.11, 1,685.09 and 716.95 is: 989.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.11 : 1,685.09 = 716.95 : x
  2. Step 2: Convert to fraction form
    1,221.11/1,685.09 = 716.95/x
  3. Step 3: Cross multiply
    1,221.11x = 1,685.09 × 716.95
  4. Step 4: Simplify right side
    1,221.11x = 1,208,131.28
  5. Step 5: Solve for x
    x = 1,208,131.28/1,221.11
  6. Step 6: Final answer
    x = 989.38

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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.