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Finding the Fourth Proportional to 783.31, 1,173.52 and 679.43

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Solution

The fourth proportional to 783.31, 1,173.52 and 679.43 is: 1,017.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.31 : 1,173.52 = 679.43 : x
  2. Step 2: Convert to fraction form
    783.31/1,173.52 = 679.43/x
  3. Step 3: Cross multiply
    783.31x = 1,173.52 × 679.43
  4. Step 4: Simplify right side
    783.31x = 797,318.83
  5. Step 5: Solve for x
    x = 797,318.83/783.31
  6. Step 6: Final answer
    x = 1,017.88

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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.