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Finding the Fourth Proportional to 786.31, 1,184.07 and 684.80

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Solution

The fourth proportional to 786.31, 1,184.07 and 684.80 is: 1,031.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.31 : 1,184.07 = 684.80 : x
  2. Step 2: Convert to fraction form
    786.31/1,184.07 = 684.80/x
  3. Step 3: Cross multiply
    786.31x = 1,184.07 × 684.80
  4. Step 4: Simplify right side
    786.31x = 810,855.03
  5. Step 5: Solve for x
    x = 810,855.03/786.31
  6. Step 6: Final answer
    x = 1,031.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.