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Finding the Fourth Proportional to 1,306.69, 1,960.79 and 485.53

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Solution

The fourth proportional to 1,306.69, 1,960.79 and 485.53 is: 728.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.69 : 1,960.79 = 485.53 : x
  2. Step 2: Convert to fraction form
    1,306.69/1,960.79 = 485.53/x
  3. Step 3: Cross multiply
    1,306.69x = 1,960.79 × 485.53
  4. Step 4: Simplify right side
    1,306.69x = 952,022.37
  5. Step 5: Solve for x
    x = 952,022.37/1,306.69
  6. Step 6: Final answer
    x = 728.58

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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.