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Finding the Fourth Proportional to 604.06, 905.70 and 257.30

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Solution

The fourth proportional to 604.06, 905.70 and 257.30 is: 385.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    604.06 : 905.70 = 257.30 : x
  2. Step 2: Convert to fraction form
    604.06/905.70 = 257.30/x
  3. Step 3: Cross multiply
    604.06x = 905.70 × 257.30
  4. Step 4: Simplify right side
    604.06x = 233,036.61
  5. Step 5: Solve for x
    x = 233,036.61/604.06
  6. Step 6: Final answer
    x = 385.78

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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.