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Finding the Fourth Proportional to 274.63, 378.99 and 158.20

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Solution

The fourth proportional to 274.63, 378.99 and 158.20 is: 218.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.63 : 378.99 = 158.20 : x
  2. Step 2: Convert to fraction form
    274.63/378.99 = 158.20/x
  3. Step 3: Cross multiply
    274.63x = 378.99 × 158.20
  4. Step 4: Simplify right side
    274.63x = 59,956.22
  5. Step 5: Solve for x
    x = 59,956.22/274.63
  6. Step 6: Final answer
    x = 218.32

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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.