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Finding the Fourth Proportional to 324.42, 485.88 and 272.40

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Solution

The fourth proportional to 324.42, 485.88 and 272.40 is: 407.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.42 : 485.88 = 272.40 : x
  2. Step 2: Convert to fraction form
    324.42/485.88 = 272.40/x
  3. Step 3: Cross multiply
    324.42x = 485.88 × 272.40
  4. Step 4: Simplify right side
    324.42x = 132,353.71
  5. Step 5: Solve for x
    x = 132,353.71/324.42
  6. Step 6: Final answer
    x = 407.97

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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.