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Finding the Fourth Proportional to 1,229.50, 1,696.71 and 763.75

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Solution

The fourth proportional to 1,229.50, 1,696.71 and 763.75 is: 1,053.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.50 : 1,696.71 = 763.75 : x
  2. Step 2: Convert to fraction form
    1,229.50/1,696.71 = 763.75/x
  3. Step 3: Cross multiply
    1,229.50x = 1,696.71 × 763.75
  4. Step 4: Simplify right side
    1,229.50x = 1,295,862.26
  5. Step 5: Solve for x
    x = 1,295,862.26/1,229.50
  6. Step 6: Final answer
    x = 1,053.98

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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.