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Finding the Fourth Proportional to 968.20, 1,452.78 and 643.48

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Solution

The fourth proportional to 968.20, 1,452.78 and 643.48 is: 965.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.20 : 1,452.78 = 643.48 : x
  2. Step 2: Convert to fraction form
    968.20/1,452.78 = 643.48/x
  3. Step 3: Cross multiply
    968.20x = 1,452.78 × 643.48
  4. Step 4: Simplify right side
    968.20x = 934,834.87
  5. Step 5: Solve for x
    x = 934,834.87/968.20
  6. Step 6: Final answer
    x = 965.54

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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.