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Finding the Fourth Proportional to 257.74, 385.80 and 203.02

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Solution

The fourth proportional to 257.74, 385.80 and 203.02 is: 303.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.74 : 385.80 = 203.02 : x
  2. Step 2: Convert to fraction form
    257.74/385.80 = 203.02/x
  3. Step 3: Cross multiply
    257.74x = 385.80 × 203.02
  4. Step 4: Simplify right side
    257.74x = 78,325.12
  5. Step 5: Solve for x
    x = 78,325.12/257.74
  6. Step 6: Final answer
    x = 303.89

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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.