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Finding the Fourth Proportional to 961.14, 1,325.43 and 628.86

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Solution

The fourth proportional to 961.14, 1,325.43 and 628.86 is: 867.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.14 : 1,325.43 = 628.86 : x
  2. Step 2: Convert to fraction form
    961.14/1,325.43 = 628.86/x
  3. Step 3: Cross multiply
    961.14x = 1,325.43 × 628.86
  4. Step 4: Simplify right side
    961.14x = 833,509.91
  5. Step 5: Solve for x
    x = 833,509.91/961.14
  6. Step 6: Final answer
    x = 867.21

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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.