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Finding the Fourth Proportional to 468.48, 645.78 and 310.86

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Solution

The fourth proportional to 468.48, 645.78 and 310.86 is: 428.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.48 : 645.78 = 310.86 : x
  2. Step 2: Convert to fraction form
    468.48/645.78 = 310.86/x
  3. Step 3: Cross multiply
    468.48x = 645.78 × 310.86
  4. Step 4: Simplify right side
    468.48x = 200,747.17
  5. Step 5: Solve for x
    x = 200,747.17/468.48
  6. Step 6: Final answer
    x = 428.51

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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.