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Finding the Fourth Proportional to 309.05, 462.93 and 257.52

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Solution

The fourth proportional to 309.05, 462.93 and 257.52 is: 385.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.05 : 462.93 = 257.52 : x
  2. Step 2: Convert to fraction form
    309.05/462.93 = 257.52/x
  3. Step 3: Cross multiply
    309.05x = 462.93 × 257.52
  4. Step 4: Simplify right side
    309.05x = 119,213.73
  5. Step 5: Solve for x
    x = 119,213.73/309.05
  6. Step 6: Final answer
    x = 385.75

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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.