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Finding the Fourth Proportional to 603.81, 905.48 and 257.31

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Solution

The fourth proportional to 603.81, 905.48 and 257.31 is: 385.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.81 : 905.48 = 257.31 : x
  2. Step 2: Convert to fraction form
    603.81/905.48 = 257.31/x
  3. Step 3: Cross multiply
    603.81x = 905.48 × 257.31
  4. Step 4: Simplify right side
    603.81x = 232,985.17
  5. Step 5: Solve for x
    x = 232,985.17/603.81
  6. Step 6: Final answer
    x = 385.86

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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.