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Finding the Fourth Proportional to 1,310.80, 1,964.92 and 626

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Solution

The fourth proportional to 1,310.80, 1,964.92 and 626 is: 938.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.80 : 1,964.92 = 626 : x
  2. Step 2: Convert to fraction form
    1,310.80/1,964.92 = 626/x
  3. Step 3: Cross multiply
    1,310.80x = 1,964.92 × 626
  4. Step 4: Simplify right side
    1,310.80x = 1,230,039.92
  5. Step 5: Solve for x
    x = 1,230,039.92/1,310.80
  6. Step 6: Final answer
    x = 938.39

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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.