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Finding the Fourth Proportional to 963.50, 1,438.56 and 789.73

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Solution

The fourth proportional to 963.50, 1,438.56 and 789.73 is: 1,179.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.50 : 1,438.56 = 789.73 : x
  2. Step 2: Convert to fraction form
    963.50/1,438.56 = 789.73/x
  3. Step 3: Cross multiply
    963.50x = 1,438.56 × 789.73
  4. Step 4: Simplify right side
    963.50x = 1,136,070.39
  5. Step 5: Solve for x
    x = 1,136,070.39/963.50
  6. Step 6: Final answer
    x = 1,179.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.