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Finding the Fourth Proportional to 963.32, 1,329.23 and 631.70

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Solution

The fourth proportional to 963.32, 1,329.23 and 631.70 is: 871.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.32 : 1,329.23 = 631.70 : x
  2. Step 2: Convert to fraction form
    963.32/1,329.23 = 631.70/x
  3. Step 3: Cross multiply
    963.32x = 1,329.23 × 631.70
  4. Step 4: Simplify right side
    963.32x = 839,674.59
  5. Step 5: Solve for x
    x = 839,674.59/963.32
  6. Step 6: Final answer
    x = 871.65

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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.