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Finding the Fourth Proportional to 427.86, 641.97 and 325.76

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Solution

The fourth proportional to 427.86, 641.97 and 325.76 is: 488.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.86 : 641.97 = 325.76 : x
  2. Step 2: Convert to fraction form
    427.86/641.97 = 325.76/x
  3. Step 3: Cross multiply
    427.86x = 641.97 × 325.76
  4. Step 4: Simplify right side
    427.86x = 209,124.94
  5. Step 5: Solve for x
    x = 209,124.94/427.86
  6. Step 6: Final answer
    x = 488.77

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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.