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Finding the Fourth Proportional to 274.50, 378.81 and 158.10

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Solution

The fourth proportional to 274.50, 378.81 and 158.10 is: 218.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.50 : 378.81 = 158.10 : x
  2. Step 2: Convert to fraction form
    274.50/378.81 = 158.10/x
  3. Step 3: Cross multiply
    274.50x = 378.81 × 158.10
  4. Step 4: Simplify right side
    274.50x = 59,889.86
  5. Step 5: Solve for x
    x = 59,889.86/274.50
  6. Step 6: Final answer
    x = 218.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.