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Finding the Fourth Proportional to 485.28, 728.10 and 300.42

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Solution

The fourth proportional to 485.28, 728.10 and 300.42 is: 450.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.28 : 728.10 = 300.42 : x
  2. Step 2: Convert to fraction form
    485.28/728.10 = 300.42/x
  3. Step 3: Cross multiply
    485.28x = 728.10 × 300.42
  4. Step 4: Simplify right side
    485.28x = 218,735.80
  5. Step 5: Solve for x
    x = 218,735.80/485.28
  6. Step 6: Final answer
    x = 450.74

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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.