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Finding the Fourth Proportional to 1,309.46, 1,959.51 and 961.97

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Solution

The fourth proportional to 1,309.46, 1,959.51 and 961.97 is: 1,439.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.46 : 1,959.51 = 961.97 : x
  2. Step 2: Convert to fraction form
    1,309.46/1,959.51 = 961.97/x
  3. Step 3: Cross multiply
    1,309.46x = 1,959.51 × 961.97
  4. Step 4: Simplify right side
    1,309.46x = 1,884,980.04
  5. Step 5: Solve for x
    x = 1,884,980.04/1,309.46
  6. Step 6: Final answer
    x = 1,439.51

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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.