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Finding the Fourth Proportional to 274.02, 411.05 and 91.43

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Solution

The fourth proportional to 274.02, 411.05 and 91.43 is: 137.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.02 : 411.05 = 91.43 : x
  2. Step 2: Convert to fraction form
    274.02/411.05 = 91.43/x
  3. Step 3: Cross multiply
    274.02x = 411.05 × 91.43
  4. Step 4: Simplify right side
    274.02x = 37,579.79
  5. Step 5: Solve for x
    x = 37,579.79/274.02
  6. Step 6: Final answer
    x = 137.14

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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.