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Finding the Fourth Proportional to 469.79, 648.28 and 257.09

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Solution

The fourth proportional to 469.79, 648.28 and 257.09 is: 354.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.79 : 648.28 = 257.09 : x
  2. Step 2: Convert to fraction form
    469.79/648.28 = 257.09/x
  3. Step 3: Cross multiply
    469.79x = 648.28 × 257.09
  4. Step 4: Simplify right side
    469.79x = 166,669.46
  5. Step 5: Solve for x
    x = 166,669.46/469.79
  6. Step 6: Final answer
    x = 354.78

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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.