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Finding the Fourth Proportional to 274.95, 378.77 and 257.94

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Solution

The fourth proportional to 274.95, 378.77 and 257.94 is: 355.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.95 : 378.77 = 257.94 : x
  2. Step 2: Convert to fraction form
    274.95/378.77 = 257.94/x
  3. Step 3: Cross multiply
    274.95x = 378.77 × 257.94
  4. Step 4: Simplify right side
    274.95x = 97,698.64
  5. Step 5: Solve for x
    x = 97,698.64/274.95
  6. Step 6: Final answer
    x = 355.33

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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.