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Finding the Fourth Proportional to 787.29, 1,179.94 and 689.56

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Solution

The fourth proportional to 787.29, 1,179.94 and 689.56 is: 1,033.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.29 : 1,179.94 = 689.56 : x
  2. Step 2: Convert to fraction form
    787.29/1,179.94 = 689.56/x
  3. Step 3: Cross multiply
    787.29x = 1,179.94 × 689.56
  4. Step 4: Simplify right side
    787.29x = 813,633.53
  5. Step 5: Solve for x
    x = 813,633.53/787.29
  6. Step 6: Final answer
    x = 1,033.46

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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.