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Finding the Fourth Proportional to 268, 369.86 and 157.45

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Solution

The fourth proportional to 268, 369.86 and 157.45 is: 217.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    268 : 369.86 = 157.45 : x
  2. Step 2: Convert to fraction form
    268/369.86 = 157.45/x
  3. Step 3: Cross multiply
    268x = 369.86 × 157.45
  4. Step 4: Simplify right side
    268x = 58,233.67
  5. Step 5: Solve for x
    x = 58,233.67/268
  6. Step 6: Final answer
    x = 217.29

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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.