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Finding the Fourth Proportional to 479.09, 660.58 and 313.25

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Solution

The fourth proportional to 479.09, 660.58 and 313.25 is: 431.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.09 : 660.58 = 313.25 : x
  2. Step 2: Convert to fraction form
    479.09/660.58 = 313.25/x
  3. Step 3: Cross multiply
    479.09x = 660.58 × 313.25
  4. Step 4: Simplify right side
    479.09x = 206,922.60
  5. Step 5: Solve for x
    x = 206,922.60/479.09
  6. Step 6: Final answer
    x = 431.91

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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.