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Finding the Fourth Proportional to 622.75, 934.31 and 257.56

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Solution

The fourth proportional to 622.75, 934.31 and 257.56 is: 386.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.75 : 934.31 = 257.56 : x
  2. Step 2: Convert to fraction form
    622.75/934.31 = 257.56/x
  3. Step 3: Cross multiply
    622.75x = 934.31 × 257.56
  4. Step 4: Simplify right side
    622.75x = 240,642.70
  5. Step 5: Solve for x
    x = 240,642.70/622.75
  6. Step 6: Final answer
    x = 386.42

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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.