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Finding the Fourth Proportional to 761.61, 1,142.46 and 274.65

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Solution

The fourth proportional to 761.61, 1,142.46 and 274.65 is: 411.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.61 : 1,142.46 = 274.65 : x
  2. Step 2: Convert to fraction form
    761.61/1,142.46 = 274.65/x
  3. Step 3: Cross multiply
    761.61x = 1,142.46 × 274.65
  4. Step 4: Simplify right side
    761.61x = 313,776.64
  5. Step 5: Solve for x
    x = 313,776.64/761.61
  6. Step 6: Final answer
    x = 411.99

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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.