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Finding the Fourth Proportional to 421.72, 632.38 and 178.02

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Solution

The fourth proportional to 421.72, 632.38 and 178.02 is: 266.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.72 : 632.38 = 178.02 : x
  2. Step 2: Convert to fraction form
    421.72/632.38 = 178.02/x
  3. Step 3: Cross multiply
    421.72x = 632.38 × 178.02
  4. Step 4: Simplify right side
    421.72x = 112,576.29
  5. Step 5: Solve for x
    x = 112,576.29/421.72
  6. Step 6: Final answer
    x = 266.95

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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.