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Finding the Fourth Proportional to 421.92, 632.88 and 205.65

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Solution

The fourth proportional to 421.92, 632.88 and 205.65 is: 308.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.92 : 632.88 = 205.65 : x
  2. Step 2: Convert to fraction form
    421.92/632.88 = 205.65/x
  3. Step 3: Cross multiply
    421.92x = 632.88 × 205.65
  4. Step 4: Simplify right side
    421.92x = 130,151.77
  5. Step 5: Solve for x
    x = 130,151.77/421.92
  6. Step 6: Final answer
    x = 308.48

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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.