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Finding the Fourth Proportional to 914.28, 1,371.96 and 481.92

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Solution

The fourth proportional to 914.28, 1,371.96 and 481.92 is: 723.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.28 : 1,371.96 = 481.92 : x
  2. Step 2: Convert to fraction form
    914.28/1,371.96 = 481.92/x
  3. Step 3: Cross multiply
    914.28x = 1,371.96 × 481.92
  4. Step 4: Simplify right side
    914.28x = 661,174.96
  5. Step 5: Solve for x
    x = 661,174.96/914.28
  6. Step 6: Final answer
    x = 723.16

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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.