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Finding the Fourth Proportional to 645.87, 968.32 and 316.71

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Solution

The fourth proportional to 645.87, 968.32 and 316.71 is: 474.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.87 : 968.32 = 316.71 : x
  2. Step 2: Convert to fraction form
    645.87/968.32 = 316.71/x
  3. Step 3: Cross multiply
    645.87x = 968.32 × 316.71
  4. Step 4: Simplify right side
    645.87x = 306,676.63
  5. Step 5: Solve for x
    x = 306,676.63/645.87
  6. Step 6: Final answer
    x = 474.83

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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.