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Finding the Fourth Proportional to 773.80, 1,160.70 and 687.24

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Solution

The fourth proportional to 773.80, 1,160.70 and 687.24 is: 1,030.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.80 : 1,160.70 = 687.24 : x
  2. Step 2: Convert to fraction form
    773.80/1,160.70 = 687.24/x
  3. Step 3: Cross multiply
    773.80x = 1,160.70 × 687.24
  4. Step 4: Simplify right side
    773.80x = 797,679.47
  5. Step 5: Solve for x
    x = 797,679.47/773.80
  6. Step 6: Final answer
    x = 1,030.86

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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.