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Finding the Fourth Proportional to 479.64, 662.39 and 313.79

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Solution

The fourth proportional to 479.64, 662.39 and 313.79 is: 433.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.64 : 662.39 = 313.79 : x
  2. Step 2: Convert to fraction form
    479.64/662.39 = 313.79/x
  3. Step 3: Cross multiply
    479.64x = 662.39 × 313.79
  4. Step 4: Simplify right side
    479.64x = 207,846.48
  5. Step 5: Solve for x
    x = 207,846.48/479.64
  6. Step 6: Final answer
    x = 433.34

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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.