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Finding the Fourth Proportional to 930.72, 1,395.40 and 443.20

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Solution

The fourth proportional to 930.72, 1,395.40 and 443.20 is: 664.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.72 : 1,395.40 = 443.20 : x
  2. Step 2: Convert to fraction form
    930.72/1,395.40 = 443.20/x
  3. Step 3: Cross multiply
    930.72x = 1,395.40 × 443.20
  4. Step 4: Simplify right side
    930.72x = 618,441.28
  5. Step 5: Solve for x
    x = 618,441.28/930.72
  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.