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Finding the Fourth Proportional to 966.63, 1,448.31 and 691.32

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Solution

The fourth proportional to 966.63, 1,448.31 and 691.32 is: 1,035.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.63 : 1,448.31 = 691.32 : x
  2. Step 2: Convert to fraction form
    966.63/1,448.31 = 691.32/x
  3. Step 3: Cross multiply
    966.63x = 1,448.31 × 691.32
  4. Step 4: Simplify right side
    966.63x = 1,001,245.67
  5. Step 5: Solve for x
    x = 1,001,245.67/966.63
  6. Step 6: Final answer
    x = 1,035.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.