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Finding the Fourth Proportional to 645.38, 968.63 and 353.15

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Solution

The fourth proportional to 645.38, 968.63 and 353.15 is: 530.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.38 : 968.63 = 353.15 : x
  2. Step 2: Convert to fraction form
    645.38/968.63 = 353.15/x
  3. Step 3: Cross multiply
    645.38x = 968.63 × 353.15
  4. Step 4: Simplify right side
    645.38x = 342,067.72
  5. Step 5: Solve for x
    x = 342,067.72/645.38
  6. Step 6: Final answer
    x = 530.03

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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.