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Finding the Fourth Proportional to 454.20, 626.72 and 257.70

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Solution

The fourth proportional to 454.20, 626.72 and 257.70 is: 355.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.20 : 626.72 = 257.70 : x
  2. Step 2: Convert to fraction form
    454.20/626.72 = 257.70/x
  3. Step 3: Cross multiply
    454.20x = 626.72 × 257.70
  4. Step 4: Simplify right side
    454.20x = 161,505.74
  5. Step 5: Solve for x
    x = 161,505.74/454.20
  6. Step 6: Final answer
    x = 355.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.