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Finding the Fourth Proportional to 453.78, 626.30 and 257.28

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Solution

The fourth proportional to 453.78, 626.30 and 257.28 is: 355.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.78 : 626.30 = 257.28 : x
  2. Step 2: Convert to fraction form
    453.78/626.30 = 257.28/x
  3. Step 3: Cross multiply
    453.78x = 626.30 × 257.28
  4. Step 4: Simplify right side
    453.78x = 161,134.46
  5. Step 5: Solve for x
    x = 161,134.46/453.78
  6. Step 6: Final answer
    x = 355.09

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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.