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Finding the Fourth Proportional to 761.79, 1,142.68 and 213.97

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Solution

The fourth proportional to 761.79, 1,142.68 and 213.97 is: 320.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.79 : 1,142.68 = 213.97 : x
  2. Step 2: Convert to fraction form
    761.79/1,142.68 = 213.97/x
  3. Step 3: Cross multiply
    761.79x = 1,142.68 × 213.97
  4. Step 4: Simplify right side
    761.79x = 244,499.24
  5. Step 5: Solve for x
    x = 244,499.24/761.79
  6. Step 6: Final answer
    x = 320.95

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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.