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Finding the Fourth Proportional to 911.20, 1,257.12 and 674.56

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Solution

The fourth proportional to 911.20, 1,257.12 and 674.56 is: 930.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.20 : 1,257.12 = 674.56 : x
  2. Step 2: Convert to fraction form
    911.20/1,257.12 = 674.56/x
  3. Step 3: Cross multiply
    911.20x = 1,257.12 × 674.56
  4. Step 4: Simplify right side
    911.20x = 848,002.87
  5. Step 5: Solve for x
    x = 848,002.87/911.20
  6. Step 6: Final answer
    x = 930.64

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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.