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Finding the Fourth Proportional to 659.49, 910.26 and 397.68

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Solution

The fourth proportional to 659.49, 910.26 and 397.68 is: 548.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.49 : 910.26 = 397.68 : x
  2. Step 2: Convert to fraction form
    659.49/910.26 = 397.68/x
  3. Step 3: Cross multiply
    659.49x = 910.26 × 397.68
  4. Step 4: Simplify right side
    659.49x = 361,992.20
  5. Step 5: Solve for x
    x = 361,992.20/659.49
  6. Step 6: Final answer
    x = 548.90

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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.