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Finding the Fourth Proportional to 470.10, 648.72 and 257.41

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Solution

The fourth proportional to 470.10, 648.72 and 257.41 is: 355.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.10 : 648.72 = 257.41 : x
  2. Step 2: Convert to fraction form
    470.10/648.72 = 257.41/x
  3. Step 3: Cross multiply
    470.10x = 648.72 × 257.41
  4. Step 4: Simplify right side
    470.10x = 166,982.48
  5. Step 5: Solve for x
    x = 166,982.48/470.10
  6. Step 6: Final answer
    x = 355.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.