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Finding the Fourth Proportional to 1,191.48, 1,786.98 and 961.71

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Solution

The fourth proportional to 1,191.48, 1,786.98 and 961.71 is: 1,442.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.48 : 1,786.98 = 961.71 : x
  2. Step 2: Convert to fraction form
    1,191.48/1,786.98 = 961.71/x
  3. Step 3: Cross multiply
    1,191.48x = 1,786.98 × 961.71
  4. Step 4: Simplify right side
    1,191.48x = 1,718,556.54
  5. Step 5: Solve for x
    x = 1,718,556.54/1,191.48
  6. Step 6: Final answer
    x = 1,442.37

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1.5x scale

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.