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Finding the Fourth Proportional to 763.81, 1,142.97 and 661.44

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Solution

The fourth proportional to 763.81, 1,142.97 and 661.44 is: 989.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.81 : 1,142.97 = 661.44 : x
  2. Step 2: Convert to fraction form
    763.81/1,142.97 = 661.44/x
  3. Step 3: Cross multiply
    763.81x = 1,142.97 × 661.44
  4. Step 4: Simplify right side
    763.81x = 756,006.08
  5. Step 5: Solve for x
    x = 756,006.08/763.81
  6. Step 6: Final answer
    x = 989.79

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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.