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Finding the Fourth Proportional to 1,306.71, 1,960.40 and 613.25

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Solution

The fourth proportional to 1,306.71, 1,960.40 and 613.25 is: 920.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.71 : 1,960.40 = 613.25 : x
  2. Step 2: Convert to fraction form
    1,306.71/1,960.40 = 613.25/x
  3. Step 3: Cross multiply
    1,306.71x = 1,960.40 × 613.25
  4. Step 4: Simplify right side
    1,306.71x = 1,202,215.30
  5. Step 5: Solve for x
    x = 1,202,215.30/1,306.71
  6. Step 6: Final answer
    x = 920.03

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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.