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Finding the Fourth Proportional to 761.14, 1,142.21 and 274.15

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Solution

The fourth proportional to 761.14, 1,142.21 and 274.15 is: 411.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.14 : 1,142.21 = 274.15 : x
  2. Step 2: Convert to fraction form
    761.14/1,142.21 = 274.15/x
  3. Step 3: Cross multiply
    761.14x = 1,142.21 × 274.15
  4. Step 4: Simplify right side
    761.14x = 313,136.87
  5. Step 5: Solve for x
    x = 313,136.87/761.14
  6. Step 6: Final answer
    x = 411.41

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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.