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Finding the Fourth Proportional to 255.99, 353.28 and 151.11

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Solution

The fourth proportional to 255.99, 353.28 and 151.11 is: 208.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.99 : 353.28 = 151.11 : x
  2. Step 2: Convert to fraction form
    255.99/353.28 = 151.11/x
  3. Step 3: Cross multiply
    255.99x = 353.28 × 151.11
  4. Step 4: Simplify right side
    255.99x = 53,384.14
  5. Step 5: Solve for x
    x = 53,384.14/255.99
  6. Step 6: Final answer
    x = 208.54

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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.