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Finding the Fourth Proportional to 936.92, 1,291.20 and 674.48

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Solution

The fourth proportional to 936.92, 1,291.20 and 674.48 is: 929.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.92 : 1,291.20 = 674.48 : x
  2. Step 2: Convert to fraction form
    936.92/1,291.20 = 674.48/x
  3. Step 3: Cross multiply
    936.92x = 1,291.20 × 674.48
  4. Step 4: Simplify right side
    936.92x = 870,888.58
  5. Step 5: Solve for x
    x = 870,888.58/936.92
  6. Step 6: Final answer
    x = 929.52

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.