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Finding the Fourth Proportional to 961.12, 1,325.28 and 629.12

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Solution

The fourth proportional to 961.12, 1,325.28 and 629.12 is: 867.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.12 : 1,325.28 = 629.12 : x
  2. Step 2: Convert to fraction form
    961.12/1,325.28 = 629.12/x
  3. Step 3: Cross multiply
    961.12x = 1,325.28 × 629.12
  4. Step 4: Simplify right side
    961.12x = 833,760.15
  5. Step 5: Solve for x
    x = 833,760.15/961.12
  6. Step 6: Final answer
    x = 867.49

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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.