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Finding the Fourth Proportional to 257.03, 354.68 and 145

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Solution

The fourth proportional to 257.03, 354.68 and 145 is: 200.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.03 : 354.68 = 145 : x
  2. Step 2: Convert to fraction form
    257.03/354.68 = 145/x
  3. Step 3: Cross multiply
    257.03x = 354.68 × 145
  4. Step 4: Simplify right side
    257.03x = 51,428.60
  5. Step 5: Solve for x
    x = 51,428.60/257.03
  6. Step 6: Final answer
    x = 200.09

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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.