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Finding the Fourth Proportional to 966.36, 1,449.24 and 643.44

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Solution

The fourth proportional to 966.36, 1,449.24 and 643.44 is: 964.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.36 : 1,449.24 = 643.44 : x
  2. Step 2: Convert to fraction form
    966.36/1,449.24 = 643.44/x
  3. Step 3: Cross multiply
    966.36x = 1,449.24 × 643.44
  4. Step 4: Simplify right side
    966.36x = 932,498.99
  5. Step 5: Solve for x
    x = 932,498.99/966.36
  6. Step 6: Final answer
    x = 964.96

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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.