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Finding the Fourth Proportional to 468.08, 645.77 and 310.78

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Solution

The fourth proportional to 468.08, 645.77 and 310.78 is: 428.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.08 : 645.77 = 310.78 : x
  2. Step 2: Convert to fraction form
    468.08/645.77 = 310.78/x
  3. Step 3: Cross multiply
    468.08x = 645.77 × 310.78
  4. Step 4: Simplify right side
    468.08x = 200,693.98
  5. Step 5: Solve for x
    x = 200,693.98/468.08
  6. Step 6: Final answer
    x = 428.76

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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.