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Finding the Fourth Proportional to 268.98, 371.28 and 158.42

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Solution

The fourth proportional to 268.98, 371.28 and 158.42 is: 218.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.98 : 371.28 = 158.42 : x
  2. Step 2: Convert to fraction form
    268.98/371.28 = 158.42/x
  3. Step 3: Cross multiply
    268.98x = 371.28 × 158.42
  4. Step 4: Simplify right side
    268.98x = 58,816.32
  5. Step 5: Solve for x
    x = 58,816.32/268.98
  6. Step 6: Final answer
    x = 218.66

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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.