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Finding the Fourth Proportional to 1,310.40, 1,964.73 and 789.10

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Solution

The fourth proportional to 1,310.40, 1,964.73 and 789.10 is: 1,183.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.40 : 1,964.73 = 789.10 : x
  2. Step 2: Convert to fraction form
    1,310.40/1,964.73 = 789.10/x
  3. Step 3: Cross multiply
    1,310.40x = 1,964.73 × 789.10
  4. Step 4: Simplify right side
    1,310.40x = 1,550,363.53
  5. Step 5: Solve for x
    x = 1,550,363.53/1,310.40
  6. Step 6: Final answer
    x = 1,183.12

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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.