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Finding the Fourth Proportional to 603.78, 905.04 and 257.28

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Solution

The fourth proportional to 603.78, 905.04 and 257.28 is: 385.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.78 : 905.04 = 257.28 : x
  2. Step 2: Convert to fraction form
    603.78/905.04 = 257.28/x
  3. Step 3: Cross multiply
    603.78x = 905.04 × 257.28
  4. Step 4: Simplify right side
    603.78x = 232,848.69
  5. Step 5: Solve for x
    x = 232,848.69/603.78
  6. Step 6: Final answer
    x = 385.65

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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.