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Finding the Fourth Proportional to 1,310.33, 1,965.81 and 385.92

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Solution

The fourth proportional to 1,310.33, 1,965.81 and 385.92 is: 578.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.33 : 1,965.81 = 385.92 : x
  2. Step 2: Convert to fraction form
    1,310.33/1,965.81 = 385.92/x
  3. Step 3: Cross multiply
    1,310.33x = 1,965.81 × 385.92
  4. Step 4: Simplify right side
    1,310.33x = 758,645.40
  5. Step 5: Solve for x
    x = 758,645.40/1,310.33
  6. Step 6: Final answer
    x = 578.97

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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.