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Finding the Fourth Proportional to 1,221.33, 1,685.26 and 717.00

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Solution

The fourth proportional to 1,221.33, 1,685.26 and 717.00 is: 989.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.33 : 1,685.26 = 717.00 : x
  2. Step 2: Convert to fraction form
    1,221.33/1,685.26 = 717.00/x
  3. Step 3: Cross multiply
    1,221.33x = 1,685.26 × 717.00
  4. Step 4: Simplify right side
    1,221.33x = 1,208,326.00
  5. Step 5: Solve for x
    x = 1,208,326.00/1,221.33
  6. Step 6: Final answer
    x = 989.35

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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.