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Finding the Fourth Proportional to 963.80, 1,330.17 and 631.64

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Solution

The fourth proportional to 963.80, 1,330.17 and 631.64 is: 871.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.80 : 1,330.17 = 631.64 : x
  2. Step 2: Convert to fraction form
    963.80/1,330.17 = 631.64/x
  3. Step 3: Cross multiply
    963.80x = 1,330.17 × 631.64
  4. Step 4: Simplify right side
    963.80x = 840,181.93
  5. Step 5: Solve for x
    x = 840,181.93/963.80
  6. Step 6: Final answer
    x = 871.74

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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.