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Finding the Fourth Proportional to 1,310.85, 1,808.92 and 721.38

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Solution

The fourth proportional to 1,310.85, 1,808.92 and 721.38 is: 995.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.85 : 1,808.92 = 721.38 : x
  2. Step 2: Convert to fraction form
    1,310.85/1,808.92 = 721.38/x
  3. Step 3: Cross multiply
    1,310.85x = 1,808.92 × 721.38
  4. Step 4: Simplify right side
    1,310.85x = 1,304,918.71
  5. Step 5: Solve for x
    x = 1,304,918.71/1,310.85
  6. Step 6: Final answer
    x = 995.48

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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.