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Finding the Fourth Proportional to 274.58, 411.81 and 76.87

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Solution

The fourth proportional to 274.58, 411.81 and 76.87 is: 115.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.58 : 411.81 = 76.87 : x
  2. Step 2: Convert to fraction form
    274.58/411.81 = 76.87/x
  3. Step 3: Cross multiply
    274.58x = 411.81 × 76.87
  4. Step 4: Simplify right side
    274.58x = 31,655.83
  5. Step 5: Solve for x
    x = 31,655.83/274.58
  6. Step 6: Final answer
    x = 115.29

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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.