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Finding the Fourth Proportional to 421.72, 632.45 and 161.70

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Solution

The fourth proportional to 421.72, 632.45 and 161.70 is: 242.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.72 : 632.45 = 161.70 : x
  2. Step 2: Convert to fraction form
    421.72/632.45 = 161.70/x
  3. Step 3: Cross multiply
    421.72x = 632.45 × 161.70
  4. Step 4: Simplify right side
    421.72x = 102,265.79
  5. Step 5: Solve for x
    x = 102,265.79/421.72
  6. Step 6: Final answer
    x = 242.50

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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.