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Finding the Fourth Proportional to 421.68, 632.28 and 205.14

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Solution

The fourth proportional to 421.68, 632.28 and 205.14 is: 307.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.68 : 632.28 = 205.14 : x
  2. Step 2: Convert to fraction form
    421.68/632.28 = 205.14/x
  3. Step 3: Cross multiply
    421.68x = 632.28 × 205.14
  4. Step 4: Simplify right side
    421.68x = 129,705.92
  5. Step 5: Solve for x
    x = 129,705.92/421.68
  6. Step 6: Final answer
    x = 307.59

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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.