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Finding the Fourth Proportional to 963.66, 1,329.39 and 631.94

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Solution

The fourth proportional to 963.66, 1,329.39 and 631.94 is: 871.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.66 : 1,329.39 = 631.94 : x
  2. Step 2: Convert to fraction form
    963.66/1,329.39 = 631.94/x
  3. Step 3: Cross multiply
    963.66x = 1,329.39 × 631.94
  4. Step 4: Simplify right side
    963.66x = 840,094.72
  5. Step 5: Solve for x
    x = 840,094.72/963.66
  6. Step 6: Final answer
    x = 871.78

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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.