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Finding the Fourth Proportional to 485.28, 727.52 and 172.85

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Solution

The fourth proportional to 485.28, 727.52 and 172.85 is: 259.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.28 : 727.52 = 172.85 : x
  2. Step 2: Convert to fraction form
    485.28/727.52 = 172.85/x
  3. Step 3: Cross multiply
    485.28x = 727.52 × 172.85
  4. Step 4: Simplify right side
    485.28x = 125,747.33
  5. Step 5: Solve for x
    x = 125,747.33/485.28
  6. Step 6: Final answer
    x = 259.12

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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.