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Finding the Fourth Proportional to 1,313.65, 1,812.81 and 789.85

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Solution

The fourth proportional to 1,313.65, 1,812.81 and 789.85 is: 1,089.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.65 : 1,812.81 = 789.85 : x
  2. Step 2: Convert to fraction form
    1,313.65/1,812.81 = 789.85/x
  3. Step 3: Cross multiply
    1,313.65x = 1,812.81 × 789.85
  4. Step 4: Simplify right side
    1,313.65x = 1,431,847.98
  5. Step 5: Solve for x
    x = 1,431,847.98/1,313.65
  6. Step 6: Final answer
    x = 1,089.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.