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Finding the Fourth Proportional to 963.09, 1,328.74 and 631.73

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Solution

The fourth proportional to 963.09, 1,328.74 and 631.73 is: 871.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.09 : 1,328.74 = 631.73 : x
  2. Step 2: Convert to fraction form
    963.09/1,328.74 = 631.73/x
  3. Step 3: Cross multiply
    963.09x = 1,328.74 × 631.73
  4. Step 4: Simplify right side
    963.09x = 839,406.66
  5. Step 5: Solve for x
    x = 839,406.66/963.09
  6. Step 6: Final answer
    x = 871.58

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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.