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Finding the Fourth Proportional to 257.34, 385.56 and 133.80

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Solution

The fourth proportional to 257.34, 385.56 and 133.80 is: 200.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.34 : 385.56 = 133.80 : x
  2. Step 2: Convert to fraction form
    257.34/385.56 = 133.80/x
  3. Step 3: Cross multiply
    257.34x = 385.56 × 133.80
  4. Step 4: Simplify right side
    257.34x = 51,587.93
  5. Step 5: Solve for x
    x = 51,587.93/257.34
  6. Step 6: Final answer
    x = 200.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.