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Finding the Fourth Proportional to 355.77, 491.40 and 257.37

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Solution

The fourth proportional to 355.77, 491.40 and 257.37 is: 355.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.77 : 491.40 = 257.37 : x
  2. Step 2: Convert to fraction form
    355.77/491.40 = 257.37/x
  3. Step 3: Cross multiply
    355.77x = 491.40 × 257.37
  4. Step 4: Simplify right side
    355.77x = 126,471.62
  5. Step 5: Solve for x
    x = 126,471.62/355.77
  6. Step 6: Final answer
    x = 355.49

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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.