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Finding the Fourth Proportional to 489.12, 732.72 and 272.52

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Solution

The fourth proportional to 489.12, 732.72 and 272.52 is: 408.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.12 : 732.72 = 272.52 : x
  2. Step 2: Convert to fraction form
    489.12/732.72 = 272.52/x
  3. Step 3: Cross multiply
    489.12x = 732.72 × 272.52
  4. Step 4: Simplify right side
    489.12x = 199,680.85
  5. Step 5: Solve for x
    x = 199,680.85/489.12
  6. Step 6: Final answer
    x = 408.25

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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.