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Finding the Fourth Proportional to 784.26, 1,175.41 and 686.53

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Solution

The fourth proportional to 784.26, 1,175.41 and 686.53 is: 1,028.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.26 : 1,175.41 = 686.53 : x
  2. Step 2: Convert to fraction form
    784.26/1,175.41 = 686.53/x
  3. Step 3: Cross multiply
    784.26x = 1,175.41 × 686.53
  4. Step 4: Simplify right side
    784.26x = 806,949.94
  5. Step 5: Solve for x
    x = 806,949.94/784.26
  6. Step 6: Final answer
    x = 1,028.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.