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Finding the Fourth Proportional to 1,306.80, 1,960.20 and 441

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Solution

The fourth proportional to 1,306.80, 1,960.20 and 441 is: 661.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.80 : 1,960.20 = 441 : x
  2. Step 2: Convert to fraction form
    1,306.80/1,960.20 = 441/x
  3. Step 3: Cross multiply
    1,306.80x = 1,960.20 × 441
  4. Step 4: Simplify right side
    1,306.80x = 864,448.20
  5. Step 5: Solve for x
    x = 864,448.20/1,306.80
  6. Step 6: Final answer
    x = 661.50

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Double scale
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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.