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Finding the Fourth Proportional to 257.35, 386.41 and 205.83

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Solution

The fourth proportional to 257.35, 386.41 and 205.83 is: 309.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.35 : 386.41 = 205.83 : x
  2. Step 2: Convert to fraction form
    257.35/386.41 = 205.83/x
  3. Step 3: Cross multiply
    257.35x = 386.41 × 205.83
  4. Step 4: Simplify right side
    257.35x = 79,534.77
  5. Step 5: Solve for x
    x = 79,534.77/257.35
  6. Step 6: Final answer
    x = 309.05

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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.