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Finding the Fourth Proportional to 961.82, 1,325.36 and 663.16

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Solution

The fourth proportional to 961.82, 1,325.36 and 663.16 is: 913.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.82 : 1,325.36 = 663.16 : x
  2. Step 2: Convert to fraction form
    961.82/1,325.36 = 663.16/x
  3. Step 3: Cross multiply
    961.82x = 1,325.36 × 663.16
  4. Step 4: Simplify right side
    961.82x = 878,926.10
  5. Step 5: Solve for x
    x = 878,926.10/961.82
  6. Step 6: Final answer
    x = 913.81

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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.