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Finding the Fourth Proportional to 468.86, 647.78 and 396.43

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Solution

The fourth proportional to 468.86, 647.78 and 396.43 is: 547.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.86 : 647.78 = 396.43 : x
  2. Step 2: Convert to fraction form
    468.86/647.78 = 396.43/x
  3. Step 3: Cross multiply
    468.86x = 647.78 × 396.43
  4. Step 4: Simplify right side
    468.86x = 256,795.82
  5. Step 5: Solve for x
    x = 256,795.82/468.86
  6. Step 6: Final answer
    x = 547.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.