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Finding the Fourth Proportional to 1,309.20, 1,960.44 and 788.64

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Solution

The fourth proportional to 1,309.20, 1,960.44 and 788.64 is: 1,180.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.20 : 1,960.44 = 788.64 : x
  2. Step 2: Convert to fraction form
    1,309.20/1,960.44 = 788.64/x
  3. Step 3: Cross multiply
    1,309.20x = 1,960.44 × 788.64
  4. Step 4: Simplify right side
    1,309.20x = 1,546,081.40
  5. Step 5: Solve for x
    x = 1,546,081.40/1,309.20
  6. Step 6: Final answer
    x = 1,180.94

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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.