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Finding the Fourth Proportional to 257.34, 385.07 and 191.91

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Solution

The fourth proportional to 257.34, 385.07 and 191.91 is: 287.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.34 : 385.07 = 191.91 : x
  2. Step 2: Convert to fraction form
    257.34/385.07 = 191.91/x
  3. Step 3: Cross multiply
    257.34x = 385.07 × 191.91
  4. Step 4: Simplify right side
    257.34x = 73,897.82
  5. Step 5: Solve for x
    x = 73,897.82/257.34
  6. Step 6: Final answer
    x = 287.16

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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.