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Finding the Fourth Proportional to 421.97, 633.30 and 178.66

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Solution

The fourth proportional to 421.97, 633.30 and 178.66 is: 268.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.97 : 633.30 = 178.66 : x
  2. Step 2: Convert to fraction form
    421.97/633.30 = 178.66/x
  3. Step 3: Cross multiply
    421.97x = 633.30 × 178.66
  4. Step 4: Simplify right side
    421.97x = 113,145.38
  5. Step 5: Solve for x
    x = 113,145.38/421.97
  6. Step 6: Final answer
    x = 268.14

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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.