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Finding the Fourth Proportional to 1,308.40, 1,960.92 and 485.92

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Solution

The fourth proportional to 1,308.40, 1,960.92 and 485.92 is: 728.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.40 : 1,960.92 = 485.92 : x
  2. Step 2: Convert to fraction form
    1,308.40/1,960.92 = 485.92/x
  3. Step 3: Cross multiply
    1,308.40x = 1,960.92 × 485.92
  4. Step 4: Simplify right side
    1,308.40x = 952,850.25
  5. Step 5: Solve for x
    x = 952,850.25/1,308.40
  6. Step 6: Final answer
    x = 728.26

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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.