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Finding the Fourth Proportional to 454.30, 626.86 and 257.74

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Solution

The fourth proportional to 454.30, 626.86 and 257.74 is: 355.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.30 : 626.86 = 257.74 : x
  2. Step 2: Convert to fraction form
    454.30/626.86 = 257.74/x
  3. Step 3: Cross multiply
    454.30x = 626.86 × 257.74
  4. Step 4: Simplify right side
    454.30x = 161,566.90
  5. Step 5: Solve for x
    x = 161,566.90/454.30
  6. Step 6: Final answer
    x = 355.64

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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.