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Finding the Fourth Proportional to 274.47, 411.75 and 91.86

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Solution

The fourth proportional to 274.47, 411.75 and 91.86 is: 137.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.47 : 411.75 = 91.86 : x
  2. Step 2: Convert to fraction form
    274.47/411.75 = 91.86/x
  3. Step 3: Cross multiply
    274.47x = 411.75 × 91.86
  4. Step 4: Simplify right side
    274.47x = 37,823.36
  5. Step 5: Solve for x
    x = 37,823.36/274.47
  6. Step 6: Final answer
    x = 137.81

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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.