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Finding the Fourth Proportional to 343.80, 474.93 and 257.54

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Solution

The fourth proportional to 343.80, 474.93 and 257.54 is: 355.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.80 : 474.93 = 257.54 : x
  2. Step 2: Convert to fraction form
    343.80/474.93 = 257.54/x
  3. Step 3: Cross multiply
    343.80x = 474.93 × 257.54
  4. Step 4: Simplify right side
    343.80x = 122,311.10
  5. Step 5: Solve for x
    x = 122,311.10/343.80
  6. Step 6: Final answer
    x = 355.76

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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.