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Finding the Fourth Proportional to 274.09, 378.17 and 156.07

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Solution

The fourth proportional to 274.09, 378.17 and 156.07 is: 215.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.09 : 378.17 = 156.07 : x
  2. Step 2: Convert to fraction form
    274.09/378.17 = 156.07/x
  3. Step 3: Cross multiply
    274.09x = 378.17 × 156.07
  4. Step 4: Simplify right side
    274.09x = 59,019.10
  5. Step 5: Solve for x
    x = 59,019.10/274.09
  6. Step 6: Final answer
    x = 215.33

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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.