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Finding the Fourth Proportional to 930.12, 1,394.76 and 443.12

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Solution

The fourth proportional to 930.12, 1,394.76 and 443.12 is: 664.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.12 : 1,394.76 = 443.12 : x
  2. Step 2: Convert to fraction form
    930.12/1,394.76 = 443.12/x
  3. Step 3: Cross multiply
    930.12x = 1,394.76 × 443.12
  4. Step 4: Simplify right side
    930.12x = 618,046.05
  5. Step 5: Solve for x
    x = 618,046.05/930.12
  6. Step 6: Final answer
    x = 664.48

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Double scale
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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.