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Finding the Fourth Proportional to 891.38, 1,228.92 and 681.68

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Solution

The fourth proportional to 891.38, 1,228.92 and 681.68 is: 939.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.38 : 1,228.92 = 681.68 : x
  2. Step 2: Convert to fraction form
    891.38/1,228.92 = 681.68/x
  3. Step 3: Cross multiply
    891.38x = 1,228.92 × 681.68
  4. Step 4: Simplify right side
    891.38x = 837,730.19
  5. Step 5: Solve for x
    x = 837,730.19/891.38
  6. Step 6: Final answer
    x = 939.81

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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.