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Finding the Fourth Proportional to 1,308.22, 1,960.83 and 613.81

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Solution

The fourth proportional to 1,308.22, 1,960.83 and 613.81 is: 920.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.22 : 1,960.83 = 613.81 : x
  2. Step 2: Convert to fraction form
    1,308.22/1,960.83 = 613.81/x
  3. Step 3: Cross multiply
    1,308.22x = 1,960.83 × 613.81
  4. Step 4: Simplify right side
    1,308.22x = 1,203,577.06
  5. Step 5: Solve for x
    x = 1,203,577.06/1,308.22
  6. Step 6: Final answer
    x = 920.01

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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.