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Finding the Fourth Proportional to 714.92, 1,072.42 and 221.67

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Solution

The fourth proportional to 714.92, 1,072.42 and 221.67 is: 332.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.92 : 1,072.42 = 221.67 : x
  2. Step 2: Convert to fraction form
    714.92/1,072.42 = 221.67/x
  3. Step 3: Cross multiply
    714.92x = 1,072.42 × 221.67
  4. Step 4: Simplify right side
    714.92x = 237,722.37
  5. Step 5: Solve for x
    x = 237,722.37/714.92
  6. Step 6: Final answer
    x = 332.52

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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.