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Finding the Fourth Proportional to 603.80, 905.86 and 257.15

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Solution

The fourth proportional to 603.80, 905.86 and 257.15 is: 385.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.80 : 905.86 = 257.15 : x
  2. Step 2: Convert to fraction form
    603.80/905.86 = 257.15/x
  3. Step 3: Cross multiply
    603.80x = 905.86 × 257.15
  4. Step 4: Simplify right side
    603.80x = 232,944.49
  5. Step 5: Solve for x
    x = 232,944.49/603.80
  6. Step 6: Final answer
    x = 385.80

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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.