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Finding the Fourth Proportional to 257.42, 385.59 and 165.65

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Solution

The fourth proportional to 257.42, 385.59 and 165.65 is: 248.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.42 : 385.59 = 165.65 : x
  2. Step 2: Convert to fraction form
    257.42/385.59 = 165.65/x
  3. Step 3: Cross multiply
    257.42x = 385.59 × 165.65
  4. Step 4: Simplify right side
    257.42x = 63,872.98
  5. Step 5: Solve for x
    x = 63,872.98/257.42
  6. Step 6: Final answer
    x = 248.13

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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.