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Finding the Fourth Proportional to 761.94, 1,142.43 and 299.78

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Solution

The fourth proportional to 761.94, 1,142.43 and 299.78 is: 449.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.94 : 1,142.43 = 299.78 : x
  2. Step 2: Convert to fraction form
    761.94/1,142.43 = 299.78/x
  3. Step 3: Cross multiply
    761.94x = 1,142.43 × 299.78
  4. Step 4: Simplify right side
    761.94x = 342,471.95
  5. Step 5: Solve for x
    x = 342,471.95/761.94
  6. Step 6: Final answer
    x = 449.47

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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.