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Finding the Fourth Proportional to 255.98, 353.31 and 156.49

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Solution

The fourth proportional to 255.98, 353.31 and 156.49 is: 215.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.98 : 353.31 = 156.49 : x
  2. Step 2: Convert to fraction form
    255.98/353.31 = 156.49/x
  3. Step 3: Cross multiply
    255.98x = 353.31 × 156.49
  4. Step 4: Simplify right side
    255.98x = 55,287.72
  5. Step 5: Solve for x
    x = 55,287.72/255.98
  6. Step 6: Final answer
    x = 215.98

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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.