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Finding the Fourth Proportional to 355.99, 491.12 and 257.53

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Solution

The fourth proportional to 355.99, 491.12 and 257.53 is: 355.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.99 : 491.12 = 257.53 : x
  2. Step 2: Convert to fraction form
    355.99/491.12 = 257.53/x
  3. Step 3: Cross multiply
    355.99x = 491.12 × 257.53
  4. Step 4: Simplify right side
    355.99x = 126,478.13
  5. Step 5: Solve for x
    x = 126,478.13/355.99
  6. Step 6: Final answer
    x = 355.29

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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.