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Finding the Fourth Proportional to 274.18, 378.31 and 156.11

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Solution

The fourth proportional to 274.18, 378.31 and 156.11 is: 215.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.18 : 378.31 = 156.11 : x
  2. Step 2: Convert to fraction form
    274.18/378.31 = 156.11/x
  3. Step 3: Cross multiply
    274.18x = 378.31 × 156.11
  4. Step 4: Simplify right side
    274.18x = 59,056.08
  5. Step 5: Solve for x
    x = 59,056.08/274.18
  6. Step 6: Final answer
    x = 215.40

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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.