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Finding the Fourth Proportional to 637.86, 956.81 and 221.42

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Solution

The fourth proportional to 637.86, 956.81 and 221.42 is: 332.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.86 : 956.81 = 221.42 : x
  2. Step 2: Convert to fraction form
    637.86/956.81 = 221.42/x
  3. Step 3: Cross multiply
    637.86x = 956.81 × 221.42
  4. Step 4: Simplify right side
    637.86x = 211,856.87
  5. Step 5: Solve for x
    x = 211,856.87/637.86
  6. Step 6: Final answer
    x = 332.14

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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.