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Finding the Fourth Proportional to 274.19, 411.21 and 79.18

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Solution

The fourth proportional to 274.19, 411.21 and 79.18 is: 118.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.19 : 411.21 = 79.18 : x
  2. Step 2: Convert to fraction form
    274.19/411.21 = 79.18/x
  3. Step 3: Cross multiply
    274.19x = 411.21 × 79.18
  4. Step 4: Simplify right side
    274.19x = 32,558.58
  5. Step 5: Solve for x
    x = 32,558.58/274.19
  6. Step 6: Final answer
    x = 118.75

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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.