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Finding the Fourth Proportional to 256.19, 353.36 and 157.91

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Solution

The fourth proportional to 256.19, 353.36 and 157.91 is: 217.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.19 : 353.36 = 157.91 : x
  2. Step 2: Convert to fraction form
    256.19/353.36 = 157.91/x
  3. Step 3: Cross multiply
    256.19x = 353.36 × 157.91
  4. Step 4: Simplify right side
    256.19x = 55,796.52
  5. Step 5: Solve for x
    x = 55,796.52/256.19
  6. Step 6: Final answer
    x = 217.80

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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.