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Finding the Fourth Proportional to 274.48, 378.76 and 156.48

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Solution

The fourth proportional to 274.48, 378.76 and 156.48 is: 215.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.48 : 378.76 = 156.48 : x
  2. Step 2: Convert to fraction form
    274.48/378.76 = 156.48/x
  3. Step 3: Cross multiply
    274.48x = 378.76 × 156.48
  4. Step 4: Simplify right side
    274.48x = 59,268.36
  5. Step 5: Solve for x
    x = 59,268.36/274.48
  6. Step 6: Final answer
    x = 215.93

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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.